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Unruh T, Götz K, Vogel C, Fröhlich E, Scheurer A, Porcar L, Steiniger F. Mesoscopic Structure of Lipid Nanoparticle Formulations for mRNA Drug Delivery: Comirnaty and Drug-Free Dispersions. ACS Nano 2024; 18:9746-9764. [PMID: 38514237 DOI: 10.1021/acsnano.4c02610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Lipid nanoparticles (LNPs) produced by antisolvent precipitation (ASP) are used in formulations for mRNA drug delivery. The mesoscopic structure of such complex multicomponent and polydisperse nanoparticulate systems is most relevant for their drug delivery properties, medical efficiency, shelf life, and possible side effects. However, the knowledge on the structural details of such formulations is very limited. Essentially no such information is publicly available for pharmaceutical dispersions approved by numerous medicine agencies for the use in humans and loaded with mRNA encoding a mimic of the spike protein of the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) as, e.g., the Comirnaty formulation (BioNTech/Pfizer). Here, we present a simple preparation method to mimic the Comirnaty drug-free LNPs including a comparison of their structural properties with those of Comirnaty. Strong evidence for the liquid state of the LNPs in both systems is found in contrast to the designation of the LNPs as solid lipid nanoparticles by BioNTech. An exceptionally detailed and reliable structural model for the LNPs i.a. revealing their unexpected narrow size distribution will be presented based on a combined small-angle X-ray scattering and photon correlation spectroscopy (SAXS/PCS) evaluation method. The results from this experimental approach are supported by light microscopy, 1H NMR spectroscopy, Raman spectroscopy, cryogenic electron microscopy (cryoTEM), and simultaneous SAXS/SANS studies. The presented results do not provide direct insights on particle formation or dispersion stability but should contribute significantly to better understanding the LNP drug delivery process, enhancing their medical benefit, and reducing side effects.
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Affiliation(s)
- Tobias Unruh
- Institute for Crystallography and Structural Physics, Physics Department, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 3, 91058 Erlangen, Germany
- Interdisciplinary Center for Nanostructured Films (IZNF) and Center for Nanoanalysis and Electron Microscopy (CENEM), Cauerstraße 3, 91058 Erlangen, Germany
| | - Klaus Götz
- Institute for Crystallography and Structural Physics, Physics Department, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 3, 91058 Erlangen, Germany
- Interdisciplinary Center for Nanostructured Films (IZNF) and Center for Nanoanalysis and Electron Microscopy (CENEM), Cauerstraße 3, 91058 Erlangen, Germany
| | - Carola Vogel
- Institute for Crystallography and Structural Physics, Physics Department, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 3, 91058 Erlangen, Germany
- Interdisciplinary Center for Nanostructured Films (IZNF) and Center for Nanoanalysis and Electron Microscopy (CENEM), Cauerstraße 3, 91058 Erlangen, Germany
| | - Erik Fröhlich
- Institute for Crystallography and Structural Physics, Physics Department, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 3, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Lehrstuhl für Anorganische und Allgemeine Chemie, Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Lionel Porcar
- Large Scale Structures Group, Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Frank Steiniger
- Electron Microscopy Center, Jena University Hospital, Friedrich Schiller University Jena, 07743 Jena, Germany
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2
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Keilwerth M, Mao W, Malischewski M, Jannuzzi SAV, Breitwieser K, Heinemann FW, Scheurer A, DeBeer S, Munz D, Bill E, Meyer K. The synthesis and characterization of an iron(VII) nitrido complex. Nat Chem 2024; 16:514-520. [PMID: 38291260 PMCID: PMC10997499 DOI: 10.1038/s41557-023-01418-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 12/08/2023] [Indexed: 02/01/2024]
Abstract
Complexes of iron in high oxidation states are captivating research subjects due to their pivotal role as active intermediates in numerous catalytic processes. Structural and spectroscopic studies of well-defined model complexes often provide evidence of these intermediates. In addition to the fundamental molecular and electronic structure insights gained by these complexes, their reactivity also affects our understanding of catalytic reaction mechanisms for small molecule and bond-activation chemistry. Here, we report the synthesis, structural and spectroscopic characterization of a stable, octahedral Fe(VI) nitrido complex and an authenticated, unique Fe(VII) species, prepared by one-electron oxidation. The super-oxidized Fe(VII) nitride rearranges to an Fe(V) imide through an intramolecular amination mechanism and ligand exchange, which is characterized spectroscopically and computationally. This enables combined reactivity and stability studies on a single molecular system of a rare high-valent complex redox pair. Quantum chemical calculations complement the spectroscopic parameters and provide evidence for a diamagnetic (S = 0) d 2 Fe(VI) and a genuine S = 1/2, d 1 Fe(VII) configuration of these super-oxidized nitrido complexes.
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Affiliation(s)
- Martin Keilwerth
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Moritz Malischewski
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Inorganic Chemistry, Berlin, Germany
| | - Sergio A V Jannuzzi
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Kevin Breitwieser
- Saarland University, Inorganic Chemistry, Coordination Chemistry, Saarbrücken, Germany
| | - Frank W Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany.
| | - Dominik Munz
- Saarland University, Inorganic Chemistry, Coordination Chemistry, Saarbrücken, Germany.
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany.
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3
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Mörtel M, Goodner SJ, Oschwald J, Scheurer A, Drewello T, Khusniyarov MM. Low-spin to low-spin valence tautomeric transition in cobalt bis-dioxolenes. Dalton Trans 2024; 53:4098-4107. [PMID: 38314834 DOI: 10.1039/d3dt03935h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Cobalt dioxolenes are a well-known class of switchable coordination compounds showing intramolecular electron transfer, which is always accompanied by a spin state change at the cobalt center. Here, we present the first example of thermally switchable cobalt bis-dioxolenes where intramolecular electron transfer seems to take place, but the spin state change is suppressed. This leads to the detection of thermal transition between a common ls-CoIII(SQ˙-)(Cat2-) and an extremely rare ls-CoII(SQ˙-)2 electronic state (hs - high-spin, ls - low-spin, SQ˙- - benzosemiquinonate(1-) radical and Cat2- - catecholate(2-)). Parallel to the present work, a similar work but on cobalt mono-dioxolenes has just appeared (Chem. Eur. J., 2023, 29, e202300091), suggesting thermal transition between ls-CoIII(Cat2-) and ls-CoII(SQ˙-) electronic states.
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Affiliation(s)
- Max Mörtel
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Germany.
| | - Stephen J Goodner
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Germany.
| | - Johannes Oschwald
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Germany.
| | - Thomas Drewello
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058, Germany
| | - Marat M Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Germany.
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4
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Hosseinmardi S, Scheurer A, Heinemann FW, Marigo N, Munz D, Meyer K. Closed Synthetic Cycle for Nickel-Based Dihydrogen Formation. Chemistry 2023; 29:e202302063. [PMID: 37615237 DOI: 10.1002/chem.202302063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/15/2023] [Accepted: 08/24/2023] [Indexed: 08/25/2023]
Abstract
Dihydrogen evolution was observed in a two-step protonation reaction starting from a Ni0 precursor with a tripodal N-heterocyclic carbene (NHC) ligand. Upon the first protonation, a NiII monohydride complex was formed, which was isolated and fully characterized. Subsequent protonation yields H2 via a transient intermediate (INT) and an isolable NiII acetonitrile complex. The latter can be reduced to regenerate its Ni0 precursor. The mechanism of H2 formation was investigated by using a deuterated acid and scrutinized by 1 H NMR spectroscopy and gas chromatography. Remarkably, the second protonation forms a rare nickel dihydrogen complex, which was detected and identified in solution and characterized by 1 H NMR spectroscopy. DFT-based computational analyses were employed to propose a reaction profile and a molecular structure of the Ni-H2 complex. Thus, a dihydrogen-evolving, closed-synthetic cycle is reported with a rare Ni-H2 species as a key intermediate.
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Affiliation(s)
- Soosan Hosseinmardi
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Nicola Marigo
- Inorganic Chemistry, Coordination Chemistry, Saarland University, Campus C4.1, 66123, Saarbrücken, Germany
| | - Dominik Munz
- Inorganic Chemistry, Coordination Chemistry, Saarland University, Campus C4.1, 66123, Saarbrücken, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
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5
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Mao W, Zhang Z, Fehn D, Jannuzzi SAV, Heinemann FW, Scheurer A, van Gastel M, DeBeer S, Munz D, Meyer K. Synthesis and Reactivity of a Cobalt-Supported Singlet Nitrene. J Am Chem Soc 2023. [PMID: 37310290 DOI: 10.1021/jacs.3c01478] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The synthesis, characterization, and reactivity of a series of cobalt terminal imido complexes supported by an N-anchored tripodal tris(carbene) chelate is described, including a Co-supported singlet nitrene. Reaction of the CoI precursor [(TIMMNmes)CoI](PF6) (TIMMNmes = tris-[2-(3-mesityl-imidazolin-2-ylidene)-methyl]amine) with p-methoxyphenyl azide yields a CoIII imide [(TIMMNmes)CoIII(NAnisole)](PF6) (1). Treatment of 1 with 1 equiv of [FeCp2](PF6) at -35 °C affords a formal CoIV imido complex [(TIMMNmes)Co(NAnisole)](PF6)2 (2), which features a bent Co-N(imido)-C(Anisole) linkage. Subsequent one-electron oxidation of 2 with 1 equiv of AgPF6 provides access to the tricationic cobalt imido complex [(TIMMNmes)Co(NAnisole)](PF6)3 (3). All complexes were fully characterized, including single-crystal X-ray diffraction (SC-XRD) analyses, infrared (IR) vibrational, ultraviolet/visible (UV/vis) electronic absorption, multinuclear NMR, X-band electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR), and high-energy-resolution fluorescence-detected X-ray absorption spectroscopy (HERFD XAS). Quantum chemical calculations provide additional insight into the electronic structures of all compounds. The dicationic CoIV imido complex 2 exhibits a doublet ground state with considerable imidyl character as a result of covalent Co-NAnisole bonding. At room temperature, 2 readily converts to a CoII amine complex involving intramolecular C-H bond amination. Electronically, tricationic complex 3 can be understood as a singlet nitrene bound to CoIII with significant CoIV imidyl radical character. Verifying the pronounced electrophilicity, nucleophiles such as H2O and tBuNH2 add to 3─analogous to the parent free nitrene─in the para position of the aromatic substituent, thus, clearly corroborating singlet nitrene-type reactivity.
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Affiliation(s)
- Weiqing Mao
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Zihan Zhang
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Dominik Fehn
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Sergio A V Jannuzzi
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Maurice van Gastel
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Dominik Munz
- Inorganic Chemistry: Coordination Chemistry, Saarland University, Campus C4 1, 66123 Saarbrücken, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
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6
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Keilwerth M, Mao W, Jannuzzi SAV, Grunwald L, Heinemann FW, Scheurer A, Sutter J, DeBeer S, Munz D, Meyer K. From Divalent to Pentavalent Iron Imido Complexes and an Fe(V) Nitride via N-C Bond Cleavage. J Am Chem Soc 2023; 145:873-887. [PMID: 36583993 DOI: 10.1021/jacs.2c09072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
As key intermediates in metal-catalyzed nitrogen-transfer chemistry, terminal imido complexes of iron have attracted significant attention for a long time. In search of versatile model compounds, the recently developed second-generation N-anchored tris-NHC chelating ligand tris-[2-(3-mesityl-imidazole-2-ylidene)-methyl]amine (TIMMNMes) was utilized to synthesize and compare two series of mid- to high-valent iron alkyl imido complexes, including a reactive Fe(V) adamantyl imido intermediate en route to an isolable Fe(V) nitrido complex. The chemistry toward the iron adamantyl imides was achieved by reacting the Fe(I) precursor [(TIMMNMes)FeI(N2)]+ (1) with 1-adamantyl azide to yield the corresponding trivalent iron imide. Stepwise chemical reduction and oxidation lead to the isostructural series of low-spin [(TIMMNMes)Fe(NAd)]0,1+,2+,3+ (2Ad-5Ad) in oxidation states II to V. The Fe(V) imide [(TIMMNMes)Fe(NAd)]3+ (5Ad) is unstable under ambient conditions and converts to the air-stable nitride [(TIMMNMes)FeV(N)]2+ (6) via N-C bond cleavage. The stability of the pentavalent imide can be increased by derivatizing the nitride [(TIMMNMes)FeIV(N)]+ (7) with an ethyl group using the triethyloxonium salt Et3OPF6. This gives access to the analogous series of ethyl imides [(TIMMNMes)Fe(NEt)]0,1+,2+,3+ (2Et-5Et), including the stable Fe(V) ethyl imide. Iron imido complexes exist in a manifold of different electronic structures, ultimately controlling their diverse reactivities. Accordingly, these complexes were characterized by single-crystal X-ray diffraction analyses, SQUID magnetization, and electrochemical methods, as well as 57Fe Mössbauer, IR vibrational, UV/vis electronic absorption, multinuclear NMR, X-band EPR, and X-ray absorption spectroscopy. Our studies are complemented with quantum chemical calculations, thus providing further insight into the electronic structures of all complexes.
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Affiliation(s)
- Martin Keilwerth
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Weiqing Mao
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Sergio A V Jannuzzi
- Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Liam Grunwald
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany.,Department of Chemistry and Applied Biosciences (D-CHAB), ETH Zürich, 8093 Zürich, Switzerland
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Jörg Sutter
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Serena DeBeer
- Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Dominik Munz
- Inorganic Chemistry: Coordination Chemistry, Saarland University, Campus C4 1, 66123 Saarbrücken, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
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Löffler ST, Hümmer J, Scheurer A, Heinemann FW, Meyer K. Unprecedented pairs of uranium (iv/v) hydroxido and (iv/v/vi) oxido complexes supported by a seven-coordinate cyclen-anchored tris-aryloxide ligand. Chem Sci 2022; 13:11341-11351. [PMID: 36320575 PMCID: PMC9533418 DOI: 10.1039/d2sc02736d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/30/2022] [Indexed: 08/05/2023] Open
Abstract
We present the synthesis and reactivity of a newly developed, cyclen-based tris-aryloxide ligand precursor, namely cyclen(Me)( t-Bu,t-BuArOH)3, and its coordination chemistry to uranium. The corresponding uranium(iii) complex [UIII((OAr t-Bu,t-Bu)3(Me)cyclen)] (1) was characterized by 1H NMR analysis, CHN elemental analysis and UV/vis/NIR electronic absorption spectroscopy. Since no single-crystals suitable for X-ray diffraction analysis could be obtained from this precursor, 1 was oxidized with methylene chloride or silver fluoride to yield [(cyclen(Me)( t-Bu,t-BuArO)3)UIV(X)] (X = Cl (2), F (3)), which were unambiguously characterized and successfully crystallized to gain insight into the molecular structure by single-crystal X-ray diffraction analysis (SC-XRD). Further, the activation of H2O and N2O by 1 is presented, resulting in the U(iv) complex [(cyclen(Me)( t-Bu,t-BuArO)3)UIV(OH)] (4) and the U(v) complex [(cyclen(Me)( t-Bu,t-BuArO)3)UV(O)] (6). Complexes 2, 3, 4, and 6 were characterized by 1H NMR analysis, CHN elemental analysis, UV/vis/NIR electronic absorption spectroscopy, IR vibrational spectroscopy, and SQUID magnetization measurements as well as cyclic voltammetry. Furthermore, chemical oxidation of 3, 4, and 6 with AgF or AgSbF6 was achieved leading to complexes [(cyclen(Me)( t-Bu,t-BuArO)3)UV(F)2] (5), [(cyclen(Me)( t-Bu,t-BuArO)3)UV(OH)][SbF6] (7), and [(cyclen(Me)( t-Bu,t-BuArO)3)UVI(O)][SbF6] (8). Finally, reduction of 7 with KC8 yielded a U(iv) complex, spectroscopically and magnetochemically identified as K[(cyclen(Me)( t-Bu,t-BuArO)3)UIV(O)].
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Affiliation(s)
- Sascha T Löffler
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy Inorganic Chemistry Egerlandstraße 1 91058 Erlangen Germany
| | - Julian Hümmer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy Inorganic Chemistry Egerlandstraße 1 91058 Erlangen Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy Inorganic Chemistry Egerlandstraße 1 91058 Erlangen Germany
| | - Frank W Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy Inorganic Chemistry Egerlandstraße 1 91058 Erlangen Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy Inorganic Chemistry Egerlandstraße 1 91058 Erlangen Germany
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8
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Mao W, Fehn D, Heinemann FW, Scheurer A, van Gastel M, Jannuzzi SAV, DeBeer S, Munz D, Meyer K. Umpolung in a Pair of Cobalt(III) Terminal Imido/Imidyl Complexes. Angew Chem Int Ed Engl 2022; 61:e202206848. [PMID: 35674679 PMCID: PMC9541304 DOI: 10.1002/anie.202206848] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Indexed: 11/12/2022]
Abstract
Reaction of the CoI complex [(TIMMNmes)CoI](PF6) (1) (TIMMNmes=tris‐[2‐(3‐mesityl‐imidazolin‐2‐ylidene)‐methyl]amine) with mesityl azide yields the CoIII imide [(TIMMNmes)CoIII(NMes)](PF6) (2). Oxidation of 2 with [FeCp2](PF6) provides access to a rare CoIII imidyl [(TIMMNmes)Co(NMes)](PF6)2 (3). Single‐crystal X‐ray diffractometry and EPR spectroscopy confirm the molecular structure of 3 and its S=1/2
ground state. ENDOR, X‐ray absorption spectroscopy and computational analyses indicate a ligand‐based oxidation; thus, an imidyl‐radical electronic structure for 3. Migratory insertion of one ancillary NHC to the imido ligand in 2 gives the CoIN‐heterocyclic imine (4) within 12 h. Conversely, it takes merely 0.5 h for 3 to transform to the CoII congener (5). The migratory insertion in 2 occurs via a nucleophilic attack of the imido ligand at the NHC to give 4, whereas in 3, a nucleophilic attack of the NHC at the electrophilic imidyl ligand yields 5. The reactivity shunt upon oxidation of 2 to 3 confirms an umpolung of the imido ligand.
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Affiliation(s)
- Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Dominik Fehn
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Maurice van Gastel
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Sergio A. V. Jannuzzi
- Max Planck Institute for Chemical Energy Conversion Stiftstr. 34–36 45470 Mülheim an der Ruhr Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion Stiftstr. 34–36 45470 Mülheim an der Ruhr Germany
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
- Current address: Saarland University Inorganic Chemistry: Coordination Chemistry Campus C4.1 66123 Saarbrücken Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
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Mao W, Fehn D, Heinemann FW, Scheurer A, van Gastel M, Jannuzzi SAV, DeBeer S, Munz D, Meyer K. Umpolung in a Pair of Cobalt(III) Terminal Imido/Imidyl Complexes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg Department of Chemistry and Pharmacy GERMANY
| | - Dominik Fehn
- Friedrich-Alexander-Universität Erlangen-Nürnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg Department of Chemistry and Pharmacy GERMANY
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg Department of Chemistry and Pharmacy GERMANY
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg Department of Chemistry and Pharmacy GERMANY
| | - Maurice van Gastel
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung Spectroscopy GERMANY
| | | | - Serena DeBeer
- Max-Planck-Institut für chemische Energiekonversion: Max-Planck-Institut fur chemische Energiekonversion Spectroscopy GERMANY
| | - Dominik Munz
- Saarland University: Universitat des Saarlandes Inorganic Chemistry: Coordination Chemistry GERMANY
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg Department Chemie und Pharmazie Anorganische ChemieEgerlandstr. 1 91058 Erlangen GERMANY
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10
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Berthel R, Purtschert L, Braillard M, Wiederkehr D, Scheurer A, Keil NM. Agonistic behaviour of dairy goats and sheep during feeding - A pilot study on Swiss farms with mixed rations. SCHWEIZ ARCH TIERH 2022; 164:457-467. [PMID: 35652256 DOI: 10.17236/sat00359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
INTRODUCTION Feeding mixed rations is a widely used practice for cattle to ensure the intake of a balanced diet and to reduce competition for food. It is unknown, whether mixed rations have the same advantages for small ruminants because they differ from cattle in their feeding and social behaviour. In this observational pilot study, an array of feeding and social behaviour of dairy goats and sheep fed ad libitum with mixed rations on Swiss farms was investigated. Twelve dairy goat and 12 dairy sheep farms feeding mixed rations were visited once during the winter feeding period. Data on the feeding management, feeding place design and the composition of the mixed rations were collected. The number of animals feeding simultaneously and the number and type of agonistic interactions during feeding were assessed by direct observations for 6 hours after the morning feed-distribution. The feeding management and the composition of the mixed rations were very heterogeneous among farms. The feed rations were mostly well balanced in relation to energy and protein and covered the requirements for the daily production of about 2,5 kg of milk. In terms of feeding simultaneously, sheep were more synchronous than goats. The mean number of agonistic interactions per feeding place within 6 hours were 3,8 in goats and 1,8 in sheep; thus, the probability to observe agonistic behaviour is higher in goats than in sheep. Goats and sheep also differed in the frequency of types of agonistic interactions. Overall, the occurrence of agonistic interactions between animals during feeding decreased with higher numbers of feeding places per animal and longer periods of time since the feed distribution. To conclude, when feeding mixed rations, agonistic interactions related to feeding are more frequent in goats but also occur in sheep to a considerable extent. They can be decreased by offering more feeding places.
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Affiliation(s)
- R Berthel
- Federal Food Safety and Veterinary Office, Centre of proper housing: ruminants and pigs, Agroscope, Switzerland
| | - L Purtschert
- Beratungs- und Gesundheitsdienst für Kleinwiederkäuer BGK
| | - M Braillard
- Service de l'agriculture SAgri, État de Fribourg
| | - D Wiederkehr
- School of Agricultural, Forest and Food Sciences, Bern University of Applied Sciences, Zollikofen, Switzerland
| | - A Scheurer
- School of Agricultural, Forest and Food Sciences, Bern University of Applied Sciences, Zollikofen, Switzerland
| | - N M Keil
- Federal Food Safety and Veterinary Office, Centre of proper housing: ruminants and pigs, Agroscope, Switzerland
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11
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Seidl V, Romero AH, Heinemann FW, Scheurer A, Vogel CS, Unruh T, Wasserscheid P, Meyer K. A New Class of Task‐Specific Imidazolium Salts and Ionic Liquids and Their Corresponding Transition‐Metal Complexes for Immobilization on Electrochemically Active Surfaces. Chemistry 2022; 28:e202200100. [PMID: 35172023 PMCID: PMC9315159 DOI: 10.1002/chem.202200100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Indexed: 11/12/2022]
Abstract
Adding to the versatile class of ionic liquids, we report the detailed structure and property analysis of a new class of asymmetrically substituted imidazolium salts, offering interesting thermal characteristics, such as liquid crystalline behavior, polymorphism or glass transitions. A scalable general synthetic procedure for N‐polyaryl‐N’‐alkyl‐functionalized imidazolium salts with para‐substituted linker (L) moieties at the aryl chain, namely [LPhmImHR]+ (L=Br, CN, SMe, CO2Et, OH; m=2, 3; R=C12, PEGn; n=2, 3, 4), was developed. These imidazolium salts were studied by single‐crystal X‐ray diffraction (SC‐XRD), NMR spectroscopy and thermochemical methods (DSC, TGA). Furthermore, these imidazolium salts were used as N‐heterocyclic carbene (NHC) ligand precursors for mononuclear, first‐row transition metal complexes (MnII, FeII, CoII, NiII, ZnII, CuI, AgI, AuI) and for the dinuclear Ti‐supported Fe‐NHC complex [(OPy)2Ti(OPh2ImC12)2(FeI2)] (OPy=pyridin‐2‐ylmethanolate). The complexes were studied concerning their structural and magnetic behavior via multi‐nuclear NMR spectroscopy, SC‐XRD analyses, variable temperature and field‐dependent (VT‐VF) SQUID magnetization methods, X‐band EPR spectroscopy and, where appropriate, zero‐field 57Fe Mössbauer spectroscopy.
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Affiliation(s)
- Vera Seidl
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
| | - Angel H. Romero
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
- Grupo de Química Orgánica Medicinal Instituto de Química Biológica Facultad de Ciencias Universidad de la República Montevideo 11400 Uruguay
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
| | - Carola S. Vogel
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Physik Institut für Physik der kondensierten Materie Staudtstraße 3 91058 Erlangen Germany
| | - Tobias Unruh
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Physik Institut für Physik der kondensierten Materie Staudtstraße 3 91058 Erlangen Germany
| | - Peter Wasserscheid
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie- und Bioingenieurwesen Egerlandstraße 3 91058 Erlangen Germany
- Forschungszentrum Jülich Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK11) Egerlandstraße 3 91058 Erlangen
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
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12
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Seidl V, Romero AH, Heinemann FW, Scheurer A, Vogel CS, Unruh T, Wasserscheid P, Meyer K. Cover Feature: A New Class of Task‐Specific Imidazolium Salts and Ionic Liquids and Their Corresponding Transition‐Metal Complexes for Immobilization on Electrochemically Active Surfaces (Chem. Eur. J. 20/2022). Chemistry 2022. [DOI: 10.1002/chem.202200812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Vera Seidl
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
| | - Angel H. Romero
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
- Grupo de Química Orgánica Medicinal Instituto de Química Biológica Facultad de Ciencias Universidad de la República Montevideo 11400 Uruguay
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
| | - Carola S. Vogel
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Physik Institut für Physik der kondensierten Materie Staudtstraße 3 91058 Erlangen Germany
| | - Tobias Unruh
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Physik Institut für Physik der kondensierten Materie Staudtstraße 3 91058 Erlangen Germany
| | - Peter Wasserscheid
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie- und Bioingenieurwesen Egerlandstraße 3 91058 Erlangen Germany
- Forschungszentrum Jülich Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK11) Egerlandstraße 3 91058 Erlangen
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Department Chemie und Pharmazie Anorganische Chemie Egerlandstraße 1 91058 Erlangen Germany
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13
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Keller M, Kreuzer M, Reidy B, Scheurer A, Guggenbühl B, Luder M, Frank J, Giller K. Effects on performance, carcass and meat quality of replacing maize silage and concentrate by grass silage and corn-cob mix in the diet of growing bulls. Meat Sci 2022; 188:108795. [DOI: 10.1016/j.meatsci.2022.108795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 02/18/2022] [Accepted: 03/02/2022] [Indexed: 10/18/2022]
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14
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Hosseinmardi S, Scheurer A, Heinemann FW, Kuepper K, Senft L, Waldschmidt P, Ivanović‐Burmazović I, Meyer K. Evaluation of Manganese Cubanoid Clusters for Water Oxidation Catalysis: From Well-Defined Molecular Coordination Complexes to Catalytically Active Amorphous Films. ChemSusChem 2021; 14:4741-4751. [PMID: 34409745 PMCID: PMC8596818 DOI: 10.1002/cssc.202101451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/17/2021] [Indexed: 06/05/2023]
Abstract
With a view to developing multimetallic molecular catalysts that mimic the oxygen-evolving catalyst (OEC) in Nature's photosystem II, the synthesis of various dicubanoid manganese clusters is described and their catalytic activity investigated for water oxidation in basic, aqueous solution. Pyridinemethanol-based ligands are known to support polynuclear and cubanoid structures in manganese coordination chemistry. The chelators 2,6-pyridinedimethanol (H2 L1 ) and 6-methyl-2-pyridinemethanol (HL2 ) were chosen to yield polynuclear manganese complexes; namely, the tetranuclear defective dicubanes [MnII 2 MnIII 2 (HL1 )4 (OAc)4 (OMe)2 ] and [MnII 2 MnIII 2 (HL1 )6 (OAc)2 ] (OAc)2 ⋅2 H2 O, as well as the octanuclear-dicubanoid [MnII 6 MnIII 2 (L2 )4 (O)2 (OAc)10 (HOMe/OH2 )2 ]⋅3MeOH⋅MeCN. In freshly prepared solutions, polynuclear species were detected by electrospray ionization mass spectrometry, whereas X-band electron paramagnetic resonance studies in dilute, liquid solution suggested the presence of divalent mononuclear Mn species with g values of 2. However, the magnetochemical investigation of the complexes' solutions by the Evans technique confirmed a haphazard combination of manganese coordination complexes, from mononuclear to polynuclear species. Subsequently, the newly synthesized and characterized manganese molecular complexes were employed as precursors to prepare electrode-deposited films in a buffer-free solution to evaluate and compare their stability and catalytic activity for water oxidation electrocatalysis.
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Affiliation(s)
- Soosan Hosseinmardi
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
| | - Andreas Scheurer
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
| | - Frank W. Heinemann
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
| | - Karsten Kuepper
- Department of PhysicsUniversity of OsnabrückBarbarastraße 749069OsnabrückGermany
| | - Laura Senft
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
- Present address: Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstraße 5–1381377MunichGermany
| | - Pablo Waldschmidt
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
| | - Ivana Ivanović‐Burmazović
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
- Present address: Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstraße 5–1381377MunichGermany
| | - Karsten Meyer
- Department of Chemistry and PharmacyInorganic ChemistryFriedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Egerlandstraße 191058ErlangenGermany
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15
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Radisavljević S, Scheurer A, Bockfeld D, Ćoćić D, Puchta R, Senft L, Pešić M, Damljanović I, Petrović B. New mononuclear gold(III) complexes: Synthesis, characterization, kinetic, mechanistic, DNA/BSA/HSA binding, DFT and molecular docking studies. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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16
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Pividori D, Miehlich ME, Kestel B, Heinemann FW, Scheurer A, Patzschke M, Meyer K. Uranium Going the Soft Way: Low-Valent Uranium(III) Coordinated to an Arene-Anchored Tris-Thiophenolate Ligand. Inorg Chem 2021; 60:16455-16465. [PMID: 34677061 DOI: 10.1021/acs.inorgchem.1c02310] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of a tripodal, S-based ligand, namely the mesitylene-anchored, tris-thiophenolate-functionalized (mes(Me,AdArS)3)3- (1)3-, and its coordination chemistry with low-valent uranium to form [UIII((SArAd,Me)3mes)] (1-U) are reported. Single-crystal X-ray diffraction analysis reveals a C3-symmetric molecular structure. Full characterization of 1-U was performed using nuclear magnetic resonance, UV-vis-NIR electronic absorption, and electron paramagnetic resonance spectroscopies as well as SQUID magnetometry, thus confirming the U(III) oxidation state. Alternating current magnetic studies show that 1-U exhibits single-molecule magnet behavior at low temperatures in a non-zero external field. Comparison of these results to those of the previously reported mesitylene-anchored complexes, [UIII((OArAd,Me)3mes)] and [UIII((OArtBu,tBu)3mes)], indicates a drastic change in the electronic structure when moving from phenolate-based ligands to thiophenolate-based 1, which is further discussed by means of computational analysis (NBO, DFT, and QTAIM). Despite the U-O bonds being stronger, a much higher covalency was found for the U-S analogue.
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Affiliation(s)
- Daniel Pividori
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Matthias E Miehlich
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Benedikt Kestel
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank W Heinemann
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Michael Patzschke
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Karsten Meyer
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstraße 1, 91058 Erlangen, Germany
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17
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Abstract
Iron methylidene species are alleged intermediates in the Fischer-Tropsch process and in olefin cyclopropanation, yet iron methylidene complexes with unambiguously established molecular and electronic structures remain elusive. In this study, we characterize an iron terminal methylidene complex by single-crystal X-ray diffractometry (scXRD), CHN combustion elemental analysis, 1H/13C/31P/1H-13C NMR, and zero-field 57Fe Mössbauer spectroscopy and study its reactivity. A series of closely related complexes in different oxidation states were synthesized, isolated and characterized in order to validate the electronic structure of the title methylidene complex. The computational analysis substantiates the proposed Fischer-type electronic description while emphasizing high Fe═CH2 bond covalency, considerable double bond order, and thus, substantial alkylidene character.
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Affiliation(s)
- Sadig Aghazada
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Inorganic Chemistry, Egerlandstrasse 1, D-91058 Erlangen, Germany
| | - Dominik Munz
- Saarland University, Inorganic Chemistry: Coordination Chemistry, Campus C4.1, D-66123 Saarbrücken, Germany
| | - Frank W Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Inorganic Chemistry, Egerlandstrasse 1, D-91058 Erlangen, Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Inorganic Chemistry, Egerlandstrasse 1, D-91058 Erlangen, Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Inorganic Chemistry, Egerlandstrasse 1, D-91058 Erlangen, Germany
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18
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Abstract
Switchable valence tautomeric metal complexes have been long suggested for applications as chemosensors. However, no such molecular sensors have been yet reported. Here, we present a concept for sensing and the first prototype molecular sensor based on valence tautomeric cobalt-dioxolenes. A valence tautomeric cobalt-dioxolene complex [ls-CoIII(SQ•)(Cat)(stypy)2] ⇄ [hs-CoII(SQ•)2(stypy)2] 1 (ls = low spin, hs = high spin, Cat = 3,5-di-tert-butylcatecholate(2-), SQ = one-electron oxidized, benzosemiquinone(1-) form of Cat, stypy = trans-4-styrylpyridine) has been used as a molecular sensor. The lability of axial stypy ligands of 1 in solution allows us to exchange stypy ligands by dimethyl sulfoxide and simple pyridine analytes in a controllable way, which triggers colorimetric and magnetic responses.
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Affiliation(s)
- Max Mörtel
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Johannes Oschwald
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Thomas Drewello
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058 Erlangen, Germany
| | - Marat M Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
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Mao W, Fehn D, Heinemann FW, Scheurer A, Munz D, Meyer K. A Pair of Cobalt(III/IV) Terminal Imido Complexes. Angew Chem Int Ed Engl 2021; 60:16480-16486. [PMID: 33847448 PMCID: PMC8362208 DOI: 10.1002/anie.202103170] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 03/29/2021] [Indexed: 12/16/2022]
Abstract
The reaction of the cobalt(I) complex [(TIMMNmes )CoI ](BPh4 ) (2) (TIMMNmes =tris-[2-(3-mesitylimidazolin-2-ylidene)methyl]amine) with 1-adamantylazide yields the cobalt(III) imido complex [(TIMMNmes )CoIII (NAd)](BPh4 ) (3) with concomitant release of dinitrogen. The N-anchor in diamagnetic 3 features an unusual, planar tertiary amine, which results from repulsive electrostatic interaction with the filled d(z2 )-orbital of the cobalt ion and negative hyperconjugation with the neighboring methylene groups. One-electron oxidation of 3 with [FeCp2 ](OTf) provides access to the rare, high-valent cobalt(IV) imido complex [(TIMMNmes )CoIV (NAd)](OTf)2 (4). Despite a half-life of less than 1 h at room temperature, 4 could be isolated at low temperatures in analytically pure form. Single-crystal X-ray diffractometry and EPR spectroscopy corroborate the molecular structure and the d5 low-spin, S= 1 / 2 , electron configuration. A computational analysis of 4 suggests high covalency within the CoIV =NAd bond with non-negligible spin density located at the imido moiety, which translates into substantial triplet nitrene character.
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Affiliation(s)
- Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Dominik Fehn
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
- Current address: Saarland UniversityInorganic Chemistry: Coordination ChemistryCampus C4.166123SaarbrückenGermany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)Inorganic ChemistryEgerlandstrasse 191058ErlangenGermany
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20
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Jovanović-Stević S, Radisavljević S, Scheurer A, Ćoćić D, Šmit B, Petković M, Živanović MN, Virijević K, Petrović B. Bis(triazinyl)pyridine complexes of Pt(II) and Pd(II): studies of the nucleophilic substitution reactions, DNA/HSA interactions, molecular docking and biological activity. J Biol Inorg Chem 2021; 26:625-637. [PMID: 34268603 DOI: 10.1007/s00775-021-01879-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/07/2021] [Indexed: 11/29/2022]
Abstract
Four new complexes of Pt(II) and Pd(II), [Pd(L1)Cl]Cl 1, [Pd(L2)Cl]Cl 2, [Pt(L1)Cl]Cl 3 and [Pt(L2)Cl]Cl 4 (where L1 = 2,6-bis(5,6-diphenyl-1,2,4-triazin-3-yl)pyridine and L2 = 2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine), were synthesized. Characterization of the complexes was performed using elemental analysis, IR, 1H NMR spectroscopy and MALDI-TOF mass spectrometry. The substitution reactions of 1-4 complexes with L-methionine (L-met), L-cysteine (L-cys) and guanosine-5'-monophosphate (5'-GMP), were studied spectrophotometrically at physiological conditions. Complexes with ligand L1 (1 or 3) were more reactive than those with ligand L2 (2 or 4) by a factor ranging up to 1.57 and 3.71, respectively. The order of reactivity of the nucleophiles was: L-met > L-cys > 5'-GMP. The interactions of complexes with calf thymus-DNA (CT-DNA) and human serum albumin (HSA) were studied by Uv-Vis absorption and fluorescence emission spectroscopy. Competitive binding studies with intercalative agent ethidium bromide (EB) and minor groove binder Hoechst 33258 were performed as well. All studied complexes can interact with DNA through the intercalation and minor groove binding, where the latter was preferred. The binding constants (103 and 104 M-1) for the interaction of complexes with HSA indicate the moderate binding affinity of complexes 1-4 to protein. The trends in the experimental results of binding studies between complexes 3 and 4 with DNA and HSA were compared to those obtained from the molecular docking study. Biological evaluation of cytotoxicity of 1 and 2 on HCT-116 and MDA-MB-231 cell lines showed significant cytotoxic and prooxidative character, while 2 also exerted extraordinary selectivity towards colon cancer in comparison to breast cancer cells. The nucleophilic substitution reactions, DNA/HSA interactions, molecular docking and biological activity of bis(triazinyl)pyridine complexes of Pt(II) and Pd(II) were studied.
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Affiliation(s)
- Snežana Jovanović-Stević
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia.
| | - Snežana Radisavljević
- Faculty of Science, University of Kragujevac, R. Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Dušan Ćoćić
- Faculty of Science, University of Kragujevac, R. Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
| | - Biljana Šmit
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia
| | - Marijana Petković
- "Vinča" Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11001, Belgrade, Serbia
| | - Marko N Živanović
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia
| | - Katarina Virijević
- Department of Natural Science, University of Kragujevac, Institute for Information Technologies Kragujevac, Jovana Cvijića Bb, 34000, Kragujevac, Serbia
| | - Biljana Petrović
- Faculty of Science, University of Kragujevac, R. Domanovića 12, P. O. Box 60, 34000, Kragujevac, Serbia
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21
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Affiliation(s)
- Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Dominik Fehn
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
- Current address: Saarland University Inorganic Chemistry: Coordination Chemistry Campus C4.1 66123 Saarbrücken Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Inorganic Chemistry Egerlandstrasse 1 91058 Erlangen Germany
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22
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Lazić D, Scheurer A, Ćoćić D, Milovanović J, Arsenijević A, Stojanović B, Arsenijević N, Milovanović M, Rilak Simović A. A new bis-pyrazolylpyridine ruthenium(III) complex as a potential anticancer drug: in vitro and in vivo activity in murine colon cancer. Dalton Trans 2021; 50:7686-7704. [PMID: 33982702 DOI: 10.1039/d1dt00185j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We synthesized and characterized the ruthenium(iii) pincer-type complex [RuCl3(H2Lt-Bu] (H2Lt-Bu = 2,6-bis(5-tert-butyl-1H-pyrazol-3-yl)pyridine, 1) by elemental analysis, IR and UV-Vis spectroscopy, and the mass spectrometry (MS) method ESI Q-TOF. For comparison reasons, we also studied ruthenium(iii) terpyridine complexes of the general formula [Ru(N-N-N)Cl3], where N-N-N = 4'-chloro-terpyridine (Cl-tpy; 2) or 4'-chlorophenyl-terpyridine (Cl-Ph-tpy; 3). A kinetic study of the substitution reactions of 1-3 with biomolecules showed that the rate constants depend on the properties of the spectator ligand and the nature of the entering nucleophile. The DNA/HSA binding study showed that in comparison to complex 1 (bis-pyrazolylpyridine), the other two (2 and 3) terpyridine complexes had a slightly better binding affinity to calf thymus DNA (CT DNA), while in the case of human serum albumin (HSA), complex 1 exhibited the strongest quenching ability. We demonstrated that 1 possesses significant in vitro cytotoxic activity against mouse colon carcinoma CT26 cells and in vivo antitumor activity in murine heterotopic colon carcinoma. Complex 1 induced G0/G1 cell cycle arrest and apoptotic death in CT26 cells. Additionally, 1 showed antiproliferative activity, as evaluated by the detection of the expression levels of the Ki67 protein. Furthermore, the in vivo results showed that 1 reduced primary tumour growth and the number and growth of lung and liver metastases, significantly prolonging the treated mice's survival rate. This study highlighted that 1 does not show hepato- and nephrotoxicity. Our data demonstrated the considerable antitumor activity of the ruthenium(iii) pincer complex against CT26 tumour cells and implicated further investigations of its role as a potential chemotherapeutic agent for colon carcinoma.
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Affiliation(s)
- Dejan Lazić
- Department of Surgery, Faculty of Medical Sciences, University of Kraujevac, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Dušan Ćoćić
- University of Kragujevac, Faculty of Science, Radoja Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Jelena Milovanović
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia. and Department of Histology, Faculty of Medical Sciences, University of Kragujevac, Serbia
| | - Aleksandar Arsenijević
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.
| | - Bojana Stojanović
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia. and Department of Pathophysiology, Faculty of Medical Sciences, University of Kragujevac, Serbia
| | - Nebojša Arsenijević
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.
| | - Marija Milovanović
- Center for Molecular Medicine and Stem Cell Research, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.
| | - Ana Rilak Simović
- University of Kragujevac, Institute for Information Technologies Kragujevac, Department of Natural Sciences, Jovana Cvijića bb, 34000 Kragujevac, Serbia.
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23
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Keller M, Reidy B, Scheurer A, Eggerschwiler L, Morel I, Giller K. Soybean Meal Can Be Replaced by Faba Beans, Pumpkin Seed Cake, Spirulina or Be Completely Omitted in a Forage-Based Diet for Fattening Bulls to Achieve Comparable Performance, Carcass and Meat Quality. Animals (Basel) 2021; 11:1588. [PMID: 34071418 PMCID: PMC8227232 DOI: 10.3390/ani11061588] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/21/2021] [Accepted: 05/22/2021] [Indexed: 01/11/2023] Open
Abstract
The aim of the study was to investigate the complete substitution of imported soybean meal in beef cattle diets and the consequences on performance, meat, and adipose tissue quality. Thirty growing crossbred Limousin bulls, with an initial bodyweight of 164 ± 13 kg and 4.3 ± 0.3 months of age, were fed a grass/maize-silage based diet with little additional concentrate (0.5:0.3:0.2). Concentrates contained either soybean meal (positive control), faba beans, pumpkin seed cake, or spirulina (Arthrospira platensis), resulting in about 226 g crude protein (CP)/kg concentrate dry matter (DM) and 158 g CP/kg total diet DM. A grain-based concentrate providing just 135 g CP/kg concentrate DM and 139 g CP/total diet DM served as a negative control. Bulls of all groups had comparable average daily gains (1.43 ± 0.1 kg) and feed intakes (6.92 ± 0.37 kg). Carcass and meat quality did not differ among groups. The fatty acid profile of meat lipids was hardly affected. These results indicate that soybean meal can be replaced by any of the tested protein sources without impairing performance or meat quality. Importantly, bulls fed the negative control achieved a fattening and slaughter performance comparable to that of the protein-supplemented groups without affecting meat and adipose tissue quality. Thus, the present findings suggest that feeding crossbred bulls a grass/maize-silage based diet does not require additional protein supplementation.
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Affiliation(s)
- Magdalena Keller
- ETH Zurich, Institute of Agricultural Sciences, Universitaetstrasse 2, 8092 Zurich, Switzerland
| | - Beat Reidy
- School of Agricultural, Forest and Food Sciences HAFL, Bern University of Applied Sciences, 3052 Zollikofen, Switzerland
| | - Andreas Scheurer
- School of Agricultural, Forest and Food Sciences HAFL, Bern University of Applied Sciences, 3052 Zollikofen, Switzerland
| | | | - Isabelle Morel
- Agroscope, Route de la Tioleyre 4, 1725 Posieux, Switzerland
| | - Katrin Giller
- ETH Zurich, Institute of Agricultural Sciences, Universitaetstrasse 2, 8092 Zurich, Switzerland
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24
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Petrović AZ, Ćoćić DC, Bockfeld D, Živanović M, Milivojević N, Virijević K, Janković N, Scheurer A, Vraneš M, Bogojeski JV. Biological activity of bis(pyrazolylpyridine) and terpiridine Os( ii) complexes in the presence of biocompatible ionic liquids. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01540g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
New bis(pyrazolylpyridine) Os(ii) complexes showing possible biological activity with diverse modes of action in the presence of biocompatible ionic liquids as non-toxic cosolvents for sparingly soluble complexes.
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Affiliation(s)
| | - Dušan C. Ćoćić
- University of Kragujevac
- Faculty of Science
- 34000 Kragujevac
- Serbia
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Marko Živanović
- University of Kragujevac
- Institute for Information Technologies Kragujevac
- Department of Science
- 34000 Kragujevac
- Serbia
| | - Nevena Milivojević
- University of Kragujevac
- Institute for Information Technologies Kragujevac
- Department of Science
- 34000 Kragujevac
- Serbia
| | - Katarina Virijević
- University of Kragujevac
- Institute for Information Technologies Kragujevac
- Department of Science
- 34000 Kragujevac
- Serbia
| | - Nenad Janković
- University of Kragujevac
- Institute for Information Technologies Kragujevac
- Department of Science
- 34000 Kragujevac
- Serbia
| | - Andreas Scheurer
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Milan Vraneš
- Department of Chemistry
- Biochemistry and Environmental Protection University of Novi Sad
- Faculty of Science
- 21000 Novi Sad
- Serbia
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25
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Balović J, Ćoćić D, Puchta R, Scheurer A, Eldik RV. The influence of the bridgehead in Saalfrank-type cryptands: prediction of ion selectivity by quantum chemical calculations XII †. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1792455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jelena Balović
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Central Institute for Scientific Computing (ZISC), University of Erlangen-Nuremberg, Erlangen, Germany
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - Dušan Ćoćić
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
- Computer Chemistry Center, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Central Institute for Scientific Computing (ZISC), University of Erlangen-Nuremberg, Erlangen, Germany
- Computer Chemistry Center, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Rudi van Eldik
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
- Faculty of Chemistry, Nicolaus Copernicus University, Toruń, Poland
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26
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Petrović A, Živanović M, Puchta R, Ćoćić D, Scheurer A, Milivojevic N, Bogojeski J. Experimental and quantum chemical study оn the DNA/protein binding and the biological activity of a rhodium(iii) complex with 1,2,4-triazole as an inert ligand. Dalton Trans 2020; 49:9070-9085. [DOI: 10.1039/d0dt01343a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A rhodium(iii) complex with 1,2,4-triazole and a pincer type nitrogen-donor ligand was synthesized, and its interaction with biomolecules was examined.
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Affiliation(s)
| | - Marko Živanović
- University of Kragujevac
- Institute of Information Technologies Kragujevac
- 34000 Kragujevac
- Serbia
| | - Ralph Puchta
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Dušan Ćoćić
- University of Kragujevac
- Faculty of Science
- 34000 Kragujevac
- Serbia
| | - Andreas Scheurer
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Nevena Milivojevic
- University of Kragujevac
- Institute of Information Technologies Kragujevac
- 34000 Kragujevac
- Serbia
| | - Jovana Bogojeski
- University of Kragujevac
- Faculty of Science
- 34000 Kragujevac
- Serbia
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27
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Keilwerth M, Hohenberger J, Heinemann FW, Sutter J, Scheurer A, Fang H, Bill E, Neese F, Ye S, Meyer K. A Series of Iron Nitrosyl Complexes {Fe-NO} 6-9 and a Fleeting {Fe-NO} 10 Intermediate en Route to a Metalacyclic Iron Nitrosoalkane. J Am Chem Soc 2019; 141:17217-17235. [PMID: 31566964 DOI: 10.1021/jacs.9b08053] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Iron-nitrosyls have fascinated chemists for a long time due to the noninnocent nature of the NO ligand that can exist in up to five different oxidation and spin states. Coordination to an open-shell iron center leads to complex electronic structures, which is the reason Enemark-Feltham introduced the {Fe-NO}n notation. In this work, we succeeded in characterizing a series of {Fe-NO}6-9 complexes, including a reactive {Fe-NO}10 intermediate. All complexes were synthesized with the tris-N-heterocyclic carbene ligand tris[2-(3-mesitylimidazol-2-ylidene)ethyl]amine (TIMENMes), which is known to support iron in high and low oxidation states. Reaction of NOBF4 with [(TIMENMes)Fe]2+ resulted in formation of the {Fe-NO}6 compound [(TIMENMes)Fe(NO)(CH3CN)](BF4)3 (1). Stepwise chemical reduction with Zn, Mg, and Na/Hg leads to the isostructural series of high-spin iron nitrosyl complexes {Fe-NO}7,8,9 (2-4). Reduction of {Fe-NO}9 with Cs electride finally yields the highly reduced {Fe-NO}10 intermediate, key to formation of [Cs(crypt-222)][(TIMENMes)Fe(NO)], (5) featuring a metalacyclic [Fe-(NO-NHC)3-] nitrosoalkane unit. All complexes were characterized by single-crystal XRD analyses, temperature and field-dependent SQUID magnetization methods, as well as 57Fe Mössbauer, IR, UV/vis, multinuclear NMR, and dual-mode EPR spectroscopy. Spectroscopy-based DFT analyses provide insight into the electronic structures of all compounds and allowed assignments of oxidation states to iron and NO ligands. An alternative synthesis to the {Fe-NO}8 complex was found via oxygenation of the nitride complex [(TIMENMes)Fe(N)](BF4). Surprisingly, the resulting {Fe-NO}8 species is electronically and structural similar to the [(TIMENMes)Fe(N)]+ precursor. Based on the structural and electronic similarities between this nitrosyl/nitride complex couple, we adopted the strategy, developed by Wieghardt et al., of extending the Enemark-Feltham nomenclature to nitrido complexes, rendering [(TIMENMes)Fe(N)]+ as a {Fe-N}8 species.
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Affiliation(s)
- Martin Keilwerth
- Department of Chemistry and Pharmacy, Inorganic Chemistry , Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Egerlandstrasse 1 , D-91058 Erlangen , Germany
| | - Johannes Hohenberger
- Department of Chemistry and Pharmacy, Inorganic Chemistry , Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Egerlandstrasse 1 , D-91058 Erlangen , Germany
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry , Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Egerlandstrasse 1 , D-91058 Erlangen , Germany
| | - Jörg Sutter
- Department of Chemistry and Pharmacy, Inorganic Chemistry , Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Egerlandstrasse 1 , D-91058 Erlangen , Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry , Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Egerlandstrasse 1 , D-91058 Erlangen , Germany
| | - Huayi Fang
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstraße 34-36 , D-45470 Mülheim an der Ruhr, Germany
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion , Stiftstraße 34-36 , D-45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelmplatz 1 , D-45470 Mülheim an der Ruhr , Germany
| | - Shengfa Ye
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelmplatz 1 , D-45470 Mülheim an der Ruhr , Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry , Friedrich-Alexander-University Erlangen-Nürnberg (FAU) , Egerlandstrasse 1 , D-91058 Erlangen , Germany
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28
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Mörtel M, Lindner T, Scheurer A, Heinemann FW, Khusniyarov MM. Phenanthroline-Based Molecular Switches for Prospective Chemical Grafting: A Synthetic Strategy and Its Application to Spin-Crossover Complexes. Inorg Chem 2019; 59:2659-2666. [PMID: 31509384 DOI: 10.1021/acs.inorgchem.9b01424] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Max Mörtel
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Thomas Lindner
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Marat M. Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
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29
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Rosenzweig MW, Hümmer J, Scheurer A, Lamsfus CA, Heinemann FW, Maron L, Mazzanti M, Meyer K. A complete series of uranium(iv) complexes with terminal hydrochalcogenido (EH) and chalcogenido (E) ligands E = O, S, Se, Te. Dalton Trans 2019; 48:10853-10864. [PMID: 30950469 DOI: 10.1039/c9dt00530g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We here report the synthesis and characterization of a complete series of terminal hydrochalcogenido, U-EH, and chalcogenido uranium(iv) complexes, U≡E (with E = O, S, Se, Te), supported by the (Ad,MeArOH)3tacn (1,4,7-tris(3-(1-adamantyl)-5-methyl-2-hydroxybenzyl)-1,4,7-triazacyclononane) ligand system. Reaction of H2E with the trivalent precursor [((Ad,MeArO)3tacn)U] (1) yields the corresponding uranium(iv) hydrochalcogenido complexes [((Ad,MeArO)3tacn)U(EH)] (2). Subsequent deprotonation of the terminal hydrochalcogenido species with KN(SiMe3)2, in the presence of 2.2.2-cryptand, gives access to the uranium(iv) complexes with terminal chalcogenido ligands [K(2.2.2-crypt)][((Ad,MeArO)3tacn)U≡E] (3). In order to study the influence of the varying terminal chalogenido ligands on the overall molecular and electronic structure, all complexes were studied by single-crystal X-ray diffractometry, UV/vis/NIR, electronic absorption, and IR vibrational spectroscopy as well as SQUID magnetometry and computational analyses (DFT, MO, NBO).
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Affiliation(s)
- Michael W Rosenzweig
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany.
| | - Julian Hümmer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany.
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany.
| | - Carlos Alvarez Lamsfus
- LPCNO, Université de Toulouse, INSA Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany.
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany.
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30
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Petrović A, Milutinović MM, Petri ET, Živanović M, Milivojević N, Puchta R, Scheurer A, Korzekwa J, Klisurić OR, Bogojeski J. Synthesis of Camphor-Derived Bis(pyrazolylpyridine) Rhodium(III) Complexes: Structure-Reactivity Relationships and Biological Activity. Inorg Chem 2018; 58:307-319. [PMID: 30565467 DOI: 10.1021/acs.inorgchem.8b02390] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Two novel rhodium(III) complexes, namely, [RhIII(X)Cl3] (X = 2 2,6-bis((4 S,7 R)-7,8,8-trimethyl-4,5,6,7-tetrahydro-1 H-4,7-methanoindazol-3-yl)pyridine or 2,6-bis((4 S,7 R)-1,7,8,8-tetramethyl-4,5,6,7-tetrahydro-1 H-4,7-methanoindazol-3-yl)pyridine), were synthesized from camphor derivatives of a bis(pyrazolylpyridine), tridentate nitrogen-donor chelate system, giving [RhIII(H2L*)Cl3] (1a) and [RhIII(Me2L*)Cl3] (1b). A rhodium(III) terpyridine (terpy) ligand complex, [RhIII(terpy)Cl3] (1c), was also synthesized. By single-crystal X-ray analysis, 1b crystallizes in an orthorhombic P212121 system, with two molecules in the asymmetric unit. Tridentate coordination by the N,N,N-donor localizes the central nitrogen atom close to the rhodium(III) center. Compounds 1a and 1b were reactive toward l-methionine (l-Met), guanosine-5'-monophosphate (5'-GMP), and glutathione (GSH), with an order of reactivity of 5'-GMP > GSH > l-Met. The order of reactivity of the RhIII complexes was: 1b> 1a > 1c. The RhIII complexes showed affinity for calf thymus DNA and bovine serum albumin by UV-vis and emission spectral studies. Furthermore, 1b showed significant in vitro cytotoxicity against human epithelial colorectal carcinoma cells. Since the RhIII complexes have similar coordination modes, stability differences were evaluated by density functional theory (DFT) calculations (B3LYP(CPCM)/LANL2DZp). With (H2L*) and (terpy) as model ligands, DFT calculations suggest that both tridentate ligand systems have similar stability. In addition, molecular docking suggests that all test compounds have affinity for the minor groove of DNA, while 1b and 1c have potential for DNA intercalation.
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Affiliation(s)
- Angelina Petrović
- Faculty of Science , University of Kragujevac , Radoja Domanovića 12 , 34000 Kragujevac , Serbia
| | - Milan M Milutinović
- Faculty of Science , University of Kragujevac , Radoja Domanovića 12 , 34000 Kragujevac , Serbia.,Department of Organic Chemistry , University of Paderborn , Warburgerstraße 100 , 33098 Paderborn , Germany
| | | | - Marko Živanović
- Faculty of Science , University of Kragujevac , Radoja Domanovića 12 , 34000 Kragujevac , Serbia
| | - Nevena Milivojević
- Faculty of Science , University of Kragujevac , Radoja Domanovića 12 , 34000 Kragujevac , Serbia
| | | | | | | | | | - Jovana Bogojeski
- Faculty of Science , University of Kragujevac , Radoja Domanovića 12 , 34000 Kragujevac , Serbia
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Grünwald A, Orth N, Scheurer A, Heinemann FW, Pöthig A, Munz D. An Isolable Terminal Imido Complex of Palladium and Catalytic Implications. Angew Chem Int Ed Engl 2018; 57:16228-16232. [PMID: 30312511 DOI: 10.1002/anie.201809152] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/21/2018] [Indexed: 11/12/2022]
Abstract
Herein, we report the isolation and a reactivity study of the first example of an elusive palladium(II) terminal imido complex. This scaffold is an alleged key intermediate for various catalytic processes, including the amination of C-H bonds. We demonstrate facile nitrene transfer with H-H, C-H, N-H, and O-H bonds and elucidate its role in catalysis. The high reactivity is due to the population of the antibonding highest occupied molecular orbital (HOMO), which results in unique charge separation within the closed-shell imido functionality. Hence, N atom transfer is not necessarily associated with the high valency of the metal (PdIII , PdIV ) or the open-shell character of a nitrene as commonly inferred.
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Affiliation(s)
- Annette Grünwald
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
| | - Nicole Orth
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
| | - Frank W Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
| | - Alexander Pöthig
- Technical University München, Catalysis Research Center, Ernst-Otto-Fischer-Straße 1, 85748, Garching, Germany
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058, Erlangen, Germany
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Grünwald A, Orth N, Scheurer A, Heinemann FW, Pöthig A, Munz D. Ein isolierbarer terminaler Imidkomplex des Palladiums und katalytische Implikationen. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809152] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Annette Grünwald
- Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Deutschland
| | - Nicole Orth
- Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Deutschland
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Deutschland
| | - Frank W. Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Deutschland
| | - Alexander Pöthig
- Technische Universität MünchenCatalysis Research Center Ernst-Otto-Fischer-Straße 1 85748 Garching Deutschland
| | - Dominik Munz
- Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Deutschland
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Ćoćić D, Jovanović S, Radisavljević S, Korzekwa J, Scheurer A, Puchta R, Baskić D, Todorović D, Popović S, Matić S, Petrović B. New monofunctional platinum(II) and palladium(II) complexes: Studies of the nucleophilic substitution reactions, DNA/BSA interaction, and cytotoxic activity. J Inorg Biochem 2018; 189:91-102. [PMID: 30243122 DOI: 10.1016/j.jinorgbio.2018.09.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 08/28/2018] [Accepted: 09/09/2018] [Indexed: 01/22/2023]
Abstract
Four new complexes [Pd(H2LtBu)Cl]Cl (Pd1), [Pt(H2LtBu)Cl]Cl (Pt1), [Pd(Me2LtBu)Cl]Cl (Pd2) and [Pt(Me2LtBu)Cl]Cl (Pt2) (where H2LtBu = 2,6-bis(5-(tert-butyl)-1H-pyrazol-3-yl)pyridine and Me2LtBu = 2,6-bis(5-(tert-butyl)-1-methyl-1H-pyrazol-3-yl)pyridine) were synthesized and characterized by elemental microanalysis, IR, 1H NMR and ESI-MS methods. The reactivity of complexes towards thiourea (Tu), l-methionine (l-Met), l-cysteine (l-Cys) and guanosine-5'-monophosphate (5'-GMP) was investigated. The obtained order was established as follows: Tu > l-Cys > l-Met > 5'-GMP. Complexes Pd1 and Pt1, that contain H2LtBu as chelator, showed higher reactivity towards biomolecules than those with Me2LtBu. The interaction of complexes with calf thymus DNA (CT-DNA) and bovine serum albumin (BSA) was studied by UV-Vis and fluorescence spectroscopy. The results have shown that complexes can bind to DNA exhibiting high binding constants (Kb = 104 M-1). Obtained results during the examination of competitive reaction with ethidium bromide (EB) showed that complexes can replace EB-bound DNA. High values of binding constants indicate good binding affinity of complexes towards BSA. We evaluated the stability differences between complexes based on terpy as well as H2LtBu/Me2LtBu by DFT calculations (B3LYP(CPCM)/LANL2DZp), showing that both tridentate ligand systems lead to complexes of similar stability. The results of biological testing showed that all complexes exert moderate to high selective cytotoxicity, inducing apoptosis and autophagy in HeLa and PANC-1 tumor cell lines. Pd1 exhibited the strongest cytotoxic effect. Finally, cell cycle analysis showed that in HeLa cells Pd1, Pd2 and Pt1 induced accumulation of cells in S phase, whereas in PANC-1 cells Pd2 and Pt1 induced G2/M cycle arrest and Pd1 induced G0/G1 arrest.
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Affiliation(s)
- Dušan Ćoćić
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Snežana Jovanović
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Snežana Radisavljević
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia
| | - Jana Korzekwa
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany; Computer Chemistry Center, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany; ZISC (Zentralinstitut für Scientific Computing), Universität Erlangen-Nürnberg, Martensstrasse 5a, 91058 Erlangen, Germany
| | - Dejan Baskić
- University of Kragujevac, Faculty of Medical Sciences, Department of Microbiology and Immunology, Center for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Danijela Todorović
- University of Kragujevac, Faculty of Medical Sciences, Department of Genetics, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Suzana Popović
- University of Kragujevac, Faculty of Medical Sciences, Department of Microbiology and Immunology, Center for Molecular Medicine and Stem Cell Research, Svetozara Markovića 69, 34000 Kragujevac, Serbia
| | - Sanja Matić
- Doctoral Academic Study, Faculty of Medical Sciences, University of Kragujevac, Svetozara Markovica 69, 34000 Kragujevac, Serbia
| | - Biljana Petrović
- University of Kragujevac, Faculty of Science, R. Domanovića 12, P. O. Box 60, 34000 Kragujevac, Serbia.
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Tong L, Wu W, Kuepper K, Scheurer A, Meyer K. Electrochemically Deposited Nickel Oxide from Molecular Complexes for Efficient Water Oxidation Catalysis. ChemSusChem 2018; 11:2752-2757. [PMID: 29883067 DOI: 10.1002/cssc.201800971] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Indexed: 06/08/2023]
Abstract
A facile method for the electrodeposition of amorphous nickel oxyhydroxide is described and discussed in which well-defined nickel complexes with pyridinedimethanol ligands are employed as single-source molecular precursors. No buffering agent is required to assist the anodic deposition process. The deposited nickel oxyhydroxide shows high robustness and efficiency for electrocatalytic water oxidation.
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Affiliation(s)
- Lianpeng Tong
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Wenling Wu
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Karsten Kuepper
- Department of Physics, University of Osnabrück, Barbarastraße 7, 49069, Osnabrück, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
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Seidel FW, Frieß S, Heinemann FW, Chelouan A, Scheurer A, Grasruck A, Herrera A, Dorta R. C2-Symmetric (SO)N(SO) Sulfoxide Pincer Complexes of Mg and Pd: Helicity Switch by Ambidentate S/O-Coordination and Isolation of a Chiral Pd-Sulfenate. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Falk W. Seidel
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Sibylle Frieß
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Ahmed Chelouan
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Alexander Grasruck
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Alberto Herrera
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Romano Dorta
- Department Chemie und Pharmazie, Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
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Milutinović MM, Bogojeski JV, Klisurić O, Scheurer A, Elmroth SKC, Bugarčić ŽD. Synthesis and structures of a pincer-type rhodium(iii) complex: reactivity toward biomolecules. Dalton Trans 2018; 45:15481-15491. [PMID: 27722449 DOI: 10.1039/c6dt02772e] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A novel rhodium(iii) complex [RhIII(H2LtBu)Cl3] (1) (H2LtBu = 2,6-bis(5-tert-butyl-1H-pyrazol-3-yl)pyridine) containing a pincer type, tridentate nitrogen-donor chelate system was synthesized. Single crystal X-ray structure analysis revealed that 1 crystallizes in the orthorhombic space group Pbcn with a = 20.7982(6), b = 10.8952(4), c = 10.9832(4) Å, V = 2488.80(15) Å3, and eight molecules in the unit cell. The rhodium center in the complex [RhIII(H2LtBu)Cl3] (1) is coordinated in a slightly distorted octahedral geometry by the tridentate N,N,N-donor and three chloro ligands, adopting a mer arrangement with an essentially planar ligand skeleton. Due to the tridentate coordination of the N,N,N-donor, the central nitrogen atom N1 is located closer to the RhIII center. The reactivity of the synthesized complex toward small biomolecules (l-methionine (l-Met), guanosine-5'-monophosphate (5'-GMP), l-histidine (l-His) and glutathione (GSH)) and to a series of duplex DNAs and RNA was investigated. The order of reactivity of the studied small biomolecules is: 5'-GMP > GSH > l-Met > l-His. Duplex RNA reacts faster with the [RhIII(H2LtBu)Cl3] complex than duplex DNA, while shorter duplex DNA (15mer GG) reacts faster compared with 22mer GG duplex DNA. In addition, a higher reactivity is achieved with a DNA duplex with a centrally located GG-sequence than with a 22GTG duplex DNA, in which the GG-sequence is separated by a T base. Furthermore, the interaction of this metal complex 1 with calf thymus DNA (CT-DNA) and bovine serum albumin (BSA) was examined by absorption (UV-Vis) and emission spectral studies (EthBr displacement studies). Overall, the studied complex exhibited good DNA and BSA interaction ability.
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Affiliation(s)
- Milan M Milutinović
- University of Kragujevac, Faculty of Science, Radoje Domanovića 12, 34000 Kragujevac, Serbia. and Lund University, Biochemistry and Structural Biology, KILU, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Jovana V Bogojeski
- University of Kragujevac, Faculty of Science, Radoje Domanovića 12, 34000 Kragujevac, Serbia.
| | - Olivera Klisurić
- University of Novi Sad, Faculty of Science, Department of Physics, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia
| | - Andreas Scheurer
- Lehrstuhl für Anorganische und Allgemeine Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
| | - Sofi K C Elmroth
- Lund University, Biochemistry and Structural Biology, KILU, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Živadin D Bugarčić
- University of Kragujevac, Faculty of Science, Radoje Domanovića 12, 34000 Kragujevac, Serbia.
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Radisavljević S, Bratsos I, Scheurer A, Korzekwa J, Masnikosa R, Tot A, Gligorijević N, Radulović S, Rilak Simović A. New gold pincer-type complexes: synthesis, characterization, DNA binding studies and cytotoxicity. Dalton Trans 2018; 47:13696-13712. [DOI: 10.1039/c8dt02903b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complex [Au(H2LtBu)Cl]Cl2(1) induced perturbations of the cell cycle and led to apoptosis in human melanoma A375 cells.
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Affiliation(s)
| | - Ioannis Bratsos
- I.N.N
- Department of Physical Chemistry
- NCSR “Demokritos”
- Athens
- Greece
| | - Andreas Scheurer
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- Erlangen
- Germany
| | - Jana Korzekwa
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- University of Erlangen-Nürnberg
- Erlangen
- Germany
| | - Romana Masnikosa
- Department of Physical Chemistry
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11000 Belgrade
- Serbia
| | - Aleksandar Tot
- University of Novi Sad
- Faculty of Sciences
- Department of Chemistry
- Biochemistry and Environmental Protection
- 21000 Novi Sad
| | | | - Siniša Radulović
- Institute for Oncology and Radiology of Serbia
- 11000 Belgrade
- Serbia
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Herrera A, Grasruck A, Heinemann FW, Scheurer A, Chelouan A, Frieß S, Seidel F, Dorta R. Developing P-Stereogenic, Planar–Chiral P-Alkene Ligands: Monodentate, Bidentate, and Double Agostic Coordination Modes on Ru(II). Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00879] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alberto Herrera
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Alexander Grasruck
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Ahmed Chelouan
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Sibylle Frieß
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Falk Seidel
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Romano Dorta
- Department Chemie und Pharmazie,
Anorganische und Allgemeine Chemie, Friedrich−Alexander−Universität Erlangen−Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
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Korzekwa J, Scheurer A, Heinemann FW, Kroener W, Gieb K, Müller P, Meyer K. Post-synthetic modification of divalent nickel acetate cubanes with carboxylates. J COORD CHEM 2017. [DOI: 10.1080/00958972.2016.1274400] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Jana Korzekwa
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Frank W. Heinemann
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | | | - Klaus Gieb
- Department of Physics, FAU, Erlangen, Germany
| | - Paul Müller
- Department of Physics, FAU, Erlangen, Germany
| | - Karsten Meyer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
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Korzekwa J, Scheurer A, Heinemann FW, Meyer K. Synthesis and characterization of uranium(iv) tetrachloro complexes in bis-pyrazolylpyridine ligand environments. Dalton Trans 2017; 46:13811-13823. [DOI: 10.1039/c7dt02947k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The most intriguing feature in structures2a–2dis the out-of-plane shift of the U ion from the chelate's three coordinating N atoms (grey background: molecular plane), as exemplarily shown for2band2d.
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Affiliation(s)
- Jana Korzekwa
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Andreas Scheurer
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Frank W. Heinemann
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Karsten Meyer
- Inorganic Chemistry
- Department of Chemistry and Pharmacy
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
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Hoerger CJ, La Pierre HS, Maron L, Scheurer A, Heinemann FW, Meyer K. Reductive disproportionation of nitric oxide mediated by low-valent uranium. Chem Commun (Camb) 2016; 52:10854-7. [PMID: 27523718 DOI: 10.1039/c6cc06095a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reductive disproportionation of nitric oxide (1 atm) is mediated by the bulky U(III) aryloxide [U(III)(OAr(Ad,Ad,Me))3] ((Ad,Ad,Me)ArO = O-C6H2-2,6-Ad-4-Me) (1) to form the U(V) terminal oxo species [((Ad,Ad,Me)ArO)3U(V)(O)] (2) and N2O, as confirmed by single crystal X-ray diffraction and GC-MS measurements. The reaction is quantitative in the solid state. Mechanistic and theoretical studies of the reaction suggest that the N-N bond is formed by the coupling of an η(1)-O bound nitric oxide ligand with gaseous NO to give an η(1)-(N2O2)(1-) intermediate prior to the spontaneous extrusion of N2O to yield the U(V) terminal oxo species 2.
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Affiliation(s)
- Christopher J Hoerger
- Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstrasse 1, 91058 Erlangen, Germany.
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Rosenzweig MW, Scheurer A, Lamsfus CA, Heinemann FW, Maron L, Andrez J, Mazzanti M, Meyer K. Uranium(iv) terminal hydrosulfido and sulfido complexes: insights into the nature of the uranium-sulfur bond. Chem Sci 2016; 7:5857-5866. [PMID: 30034726 PMCID: PMC6024247 DOI: 10.1039/c6sc00677a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 05/09/2016] [Indexed: 11/21/2022] Open
Abstract
Herein, we report the synthesis and characterization of a series of terminal uranium(iv) hydrosulfido and sulfido complexes, supported by the hexadentate, tacn-based ligand framework (Ad,MeArO)3tacn3- (= trianion of 1,4,7-tris(3-(1-adamantyl)-5-methyl-2-hydroxybenzyl)-1,4,7-triazacyclononane). The hydrosulfido complex [((Ad,MeArO)3tacn)U-SH] (2) is obtained from the reaction of H2S with the uranium(iii) starting material [((Ad,MeArO)3tacn)U] (1) in THF. Subsequent deprotonation with potassium bis(trimethylsilyl)amide yields the mononuclear uranium(iv) sulfido species in good yields. With the aid of dibenzo-18-crown-6 and 2.2.2-cryptand, it was possible to isolate a terminal sulfido species, capped by the potassium counter ion, and a "free" terminal sulfido species with a well separated cation/anion pair. Spectroscopic and computational analyses provided insights into the nature of the uranium-sulfur bond in these complexes.
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Affiliation(s)
- Michael W Rosenzweig
- Department of Chemistry and Pharmacy , Inorganic Chemistry , Friedrich-Alexander University Erlangen-Nürnberg , Egerlandstraße 1 , 91058 Erlangen , Germany .
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy , Inorganic Chemistry , Friedrich-Alexander University Erlangen-Nürnberg , Egerlandstraße 1 , 91058 Erlangen , Germany .
| | - Carlos A Lamsfus
- LPCNO , Université de Toulouse , INSA Toulouse , 135 Avenue de Rangueil , 31077 Toulouse , France
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy , Inorganic Chemistry , Friedrich-Alexander University Erlangen-Nürnberg , Egerlandstraße 1 , 91058 Erlangen , Germany .
| | - Laurent Maron
- LPCNO , Université de Toulouse , INSA Toulouse , 135 Avenue de Rangueil , 31077 Toulouse , France
| | - Julie Andrez
- Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Karsten Meyer
- Department of Chemistry and Pharmacy , Inorganic Chemistry , Friedrich-Alexander University Erlangen-Nürnberg , Egerlandstraße 1 , 91058 Erlangen , Germany .
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Begel S, Scheurer A, Puchta R, van Eldik R. Host-Guest Complexes of [TriPip222], the Piperazine Analogue of [2.2.2]: Prediction of Ion Selectivity by Quantum Chemical Calculations VIII[#]. Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Affiliation(s)
- Svetlana Begel
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Andreas Scheurer
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Universität Erlangen-Nürnberg, Erlangen, Germany
- Department of Chemistry and Pharmacy, Computer Chemistry Center, Universität Erlangen-Nürnberg, Erlangen, Germany
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Kropp H, Scheurer A, Heinemann FW, Bendix J, Meyer K. Coordination-Induced Spin-State Change in Manganese(V) Complexes: The Electronic Structure of Manganese(V) Nitrides. Inorg Chem 2015; 54:3562-72. [DOI: 10.1021/acs.inorgchem.5b00112] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Henning Kropp
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
| | - Jesper Bendix
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstrasse
1, 91058 Erlangen, Germany
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Scheurer A, Korzekwa J, Nakajima T, Hampel F, Buling A, Derks C, Neumann M, Joly L, Petukhov K, Gieb K, Müller P, Kuepper K, Meyer K. Synthesis, Magnetic Properties, and X-ray Spectroscopy of Divalent Cobalt(II) and Nickel(II) Cubanes [MII4(HL2)4(OAc)4]. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201402988] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Nakajima T, Seto K, Scheurer A, Kure B, Kajiwara T, Tanase T, Mikuriya M, Sakiyama H. Tetranuclear Nickel and Cobalt Complexes with an Incomplete Double‐Cubane Structure – Homo‐ and Heterometallic Complexes and Their 1D Coordination Polymers. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402536] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Takayuki Nakajima
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya‐nishi‐machi, Nara 630‐8506, Japan, http://www.chem.narawu.ac.jp/~tanase/TanaseGroup/
| | - Keiko Seto
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya‐nishi‐machi, Nara 630‐8506, Japan, http://www.chem.narawu.ac.jp/~tanase/TanaseGroup/
| | - Andreas Scheurer
- Department für Chemie und Pharmazie, Lehrstuhl für Anorganische und Allgemeine Chemie, Universität Erlangen‐Nürnberg, Egerlandstr, 1 91058 Erlangen, Germany
| | - Bunsho Kure
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya‐nishi‐machi, Nara 630‐8506, Japan, http://www.chem.narawu.ac.jp/~tanase/TanaseGroup/
| | - Takashi Kajiwara
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya‐nishi‐machi, Nara 630‐8506, Japan, http://www.chem.narawu.ac.jp/~tanase/TanaseGroup/
| | - Tomoaki Tanase
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya‐nishi‐machi, Nara 630‐8506, Japan, http://www.chem.narawu.ac.jp/~tanase/TanaseGroup/
| | - Masahiro Mikuriya
- Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2‐1 Gakeun, Sanda‐shi, Hyogo 669‐1337, Japan
| | - Hiroshi Sakiyama
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Kojirakawa, Yamagata 990‐28560, Japan
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Puchta R, Scheurer A. Sind Metalloprotonencryptanden möglich? – DFT-Studie zur Protonenaffinität von [2.2.2]-analogen Metallocryptanden / Can Metallocryptands act as Proton Cages? – DFT Study of Proton Affinity in [2.2.2]-analogousMetallocryptands Sind Metalloprotonencryptanden m¨oglich? – DFT-Studie zur Protonenaffinit¨at von [2.2.2]-analogen Metallocryptanden. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-2010-0303] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Based on density functional calculations (RB3LYP/LANL2DZp) the bicyclic metallocryptand [Pd3(L2)2] [(L2)3−: 1,1´ ,1´´-nitrilotris(5,5-dimethylhexane-2,4-dione trianion)] shows the same high gas-phase basicity (−257.1 kcal mol−1) as Lehn’s [2.2.2] cryptand (−254.4 kcal mol−1). This illustrates that the concept of metallotopomers adopted by Saalfrank et al. can be applied to design proton sponges as well as proton cryptands by metallosupramolecular coordination chemistry. The slightly higher gas-phase proton affinity of [Pd3(L2)2] compared to [2.2.2] can be attributed to the smaller cavity in the metallotopomer.
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Affiliation(s)
- Ralph Puchta
- Anorganische Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Anorganische Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
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Saalfrank RW, Reimann U, Scheurer A, Hampel F, Goebel C, Herbst-Irmer R. {2}Metallocryptands of Iron and Gallium: Synthesis, Structure, and Properties [1]. Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-2009-0401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Starting from CH-acidic tetradentate ligands H2L (1) and triethylamine, the synthesis and characterisation of four dinuclear iron(III) and gallium(III) cryptands [M2(L)3] (3, 4) are reported. The structures of the ligand H2L (1a) and the triple helicate 3b were determined by X-ray diffraction analysis. The ferric complexes 3 were further characterised by Mössbauer spectroscopy and cyclic voltammetry. NMR spectroscopy proved the diamagnetic gallium(III) cryptands 4 to remain stable in solution for several days.
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Affiliation(s)
- Rolf W. Saalfrank
- Department Chemie und Pharmazie, Lehrstuhl für Anorganische und Allgemeine Chemie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Uwe Reimann
- Department Chemie und Pharmazie, Lehrstuhl für Anorganische und Allgemeine Chemie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department Chemie und Pharmazie, Lehrstuhl für Anorganische und Allgemeine Chemie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| | - Frank Hampel
- Department Chemie und Pharmazie, Organische Chemie, Universität Erlangen-Nürnberg, Henkestraße 42, 91054 Erlangen, Germany
| | - Cornelia Goebel
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Regine Herbst-Irmer
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
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Alam MS, Scheurer A, Saalfrank RW, Müller P. STM Analysis of a Chiral Helical Onedimensional Nickel(II) Coordination Polymer. Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-2008-1218] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
C2-symmetric nickel(II) salen complexes [NiL] 1 were deposited on a highly oriented pyrolytic graphite (HOPG) surface from their acetone solutions. They aggregate easily to single, segregated, homochiral polymeric chains of (M)-1D- 1
n [NiL] (2) on the substrate as also found in single crystals. In STM topography, the single helical 1D structures 2 found on the surface were in excellent agreement with the dimension of aligned dimeric aggregates of 1 obtained from X-ray crystallography. Weak intermolecular NiII...OMe coordinations (dMeO−Ni = 0.35 nm) were found to be responsible for the formation of the chiral, helical and 1D assemblies on the substrate.
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Affiliation(s)
- Mohammad Sahabul Alam
- Department für Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany
- Department of Physics, University of Dhaka, Dhaka-1000, Bangladesh
| | - Andreas Scheurer
- Lehrstuhl für Anorganische und Allgemeine Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91056 Erlangen, Germany
| | - Rolf W. Saalfrank
- Lehrstuhl für Anorganische und Allgemeine Chemie, Department Chemie und Pharmazie, Universität Erlangen-Nürnberg, Egerlandstraße 1, 91056 Erlangen, Germany
| | - Paul Müller
- Department für Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany
- Department of Physics, University of Dhaka, Dhaka-1000, Bangladesh
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