1
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Hoving M, Haaksma JJ, Stoppel A, Chronc L, Hoffmann J, Beil SB. Triplet Energy Transfer Mechanism in Copper Photocatalytic N- and O-Methylation. Chemistry 2024; 30:e202400560. [PMID: 38363220 DOI: 10.1002/chem.202400560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 02/15/2024] [Accepted: 02/16/2024] [Indexed: 02/17/2024]
Abstract
Methylation reactions are chemically simple but challenging to perform under mild and non-toxic conditions. A photochemical energy transfer strategy was merged with copper catalysis to enable fast reaction times of minutes and broad applicability to N-heterocycles, (hetero-)aromatic carboxylic acids, and drug-like molecules in high yields and good functional group tolerance. Detailed mechanistic investigations, using kinetic analysis, aprotic MS, UV/Vis, and luminescence quenching experiments revealed a triplet-triplet energy transfer mechanism between hypervalent iodine(III) reagents and readily available photosensitizers.
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Affiliation(s)
- Martijn Hoving
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Jacob-Jan Haaksma
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Anne Stoppel
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Lukas Chronc
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Jonas Hoffmann
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Sebastian B Beil
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG, Groningen, The Netherlands
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2
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Santanni F, Briganti M, Serrano G, Salvadori E, Veneri A, Batistoni C, Russi SF, Menichetti S, Mannini M, Chiesa M, Sorace L, Sessoli R. VdW Mediated Strong Magnetic Exchange Interactions in Chains of Hydrogen-Free Sublimable Molecular Qubits. JACS AU 2023; 3:1250-1262. [PMID: 37124308 PMCID: PMC10131211 DOI: 10.1021/jacsau.3c00121] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 03/31/2023] [Accepted: 03/31/2023] [Indexed: 05/03/2023]
Abstract
Sulfur-rich molecular complexes of dithiolene-like ligands are appealing candidates as molecular spin qubits because spin coherence properties are enhanced in hydrogen-free environments. Herein, we employ the hydrogen-free mononegative 1,3,2-dithiazole-4-thione-5-thiolate (dttt-) ligand as an alternative to common dinegative dithiolate ligands. We report the first synthesis and structural characterization of its Cu2+, Ni2+, and Pt2+ neutral complexes. The XPS analysis of thermal deposition of [Cu(dttt)2] in UHV conditions indicates that films of intact molecules can be deposited on surfaces by sublimation. Thanks to a combined approach employing DC magnetometry and DFT calculations, we highlighted AF exchange interactions of 108 cm-1 and 36 cm-1 attributed to the two different polymorph phases. These couplings are exclusively mediated by S···S VdW interactions, which are facilitated by the absence of counterions and made particularly efficient by the diffuse electron density on S atoms. Furthermore, the spin dynamics of solid-state magnetically diluted samples was investigated. The longest observed T m is 2.3 μs at 30 K, which significantly diverges from the predicted T m > 100 μs. These results point to the diluting matrix severely affecting the coherence lifetime of Cu2+ species via different factors, such as the contributions of neighboring 14N nuclei and the formation of radical impurities in a non-completely controllable way. However, the ease of processing [Cu(dttt)2] via thermal sublimation can allow dispersion in matrices better suited for coherent spin manipulation of isolated molecules and the realization of AF-coupled VdW structures on surfaces.
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Affiliation(s)
- Fabio Santanni
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Matteo Briganti
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Giulia Serrano
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
- Dipartimento
di Ingegneria Industriale - DIEF, Università
degli Studi di Firenze, Via Santa Marta 3, I-50139 Firenze, Italy
| | - Enrico Salvadori
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
- Dipartimento
di Chimica e NIS Centre, Università
di Torino, Via P. Giuria 7, I-10125 Torino, Italy
| | - Alessandro Veneri
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Chiara Batistoni
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Sofia F. Russi
- Dipartimento
di Chimica e NIS Centre, Università
di Torino, Via P. Giuria 7, I-10125 Torino, Italy
| | - Stefano Menichetti
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Matteo Mannini
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Mario Chiesa
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
- Dipartimento
di Chimica e NIS Centre, Università
di Torino, Via P. Giuria 7, I-10125 Torino, Italy
| | - Lorenzo Sorace
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Roberta Sessoli
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
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3
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Gómez-Piñeiro RJ, Drosou M, Bertaina S, Decroos C, Simaan AJ, Pantazis DA, Orio M. Decoding the Ambiguous Electron Paramagnetic Resonance Signals in the Lytic Polysaccharide Monooxygenase from Photorhabdus luminescens. Inorg Chem 2022; 61:8022-8035. [PMID: 35549254 PMCID: PMC9131454 DOI: 10.1021/acs.inorgchem.2c00766] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding the structure and function of lytic polysaccharide monooxygenases (LPMOs), copper enzymes that degrade recalcitrant polysaccharides, requires the reliable atomistic interpretation of electron paramagnetic resonance (EPR) data on the Cu(II) active site. Among various LPMO families, the chitin-active PlAA10 shows an intriguing phenomenology with distinct EPR signals, a major rhombic and a minor axial signal. Here, we combine experimental and computational investigations to uncover the structural identity of these signals. X-band EPR spectra recorded at different pH values demonstrate pH-dependent population inversion: the major rhombic signal at pH 6.5 becomes minor at pH 8.5, where the axial signal dominates. This suggests that a protonation change is involved in the interconversion. Precise structural interpretations are pursued with quantum chemical calculations. Given that accurate calculations of Cu g-tensors remain challenging for quantum chemistry, we first address this problem via a thorough calibration study. This enables us to define a density functional that achieves accurate and reliable prediction of g-tensors, giving confidence in our evaluation of PlAA10 LPMO models. Large models were considered that include all parts of the protein matrix surrounding the Cu site, along with the characteristic second-sphere features of PlAA10. The results uniquely identify the rhombic signal with a five-coordinate Cu ion bearing two water molecules in addition to three N-donor ligands. The axial signal is attributed to a four-coordinate Cu ion where only one of the waters remains bound, as hydroxy. Alternatives that involve decoordination of the histidine brace amino group are unlikely based on energetics and spectroscopy. These results provide a reliable spectroscopy-consistent view on the plasticity of the resting state in PlAA10 LPMO as a foundation for further elucidating structure-property relationships and the formation of catalytically competent species. Our strategy is generally applicable to the study of EPR parameters of mononuclear copper-containing metalloenzymes.
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Affiliation(s)
| | - Maria Drosou
- Inorganic Chemistry Laboratory, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou 15771, Greece
| | - Sylvain Bertaina
- Aix-Marseille Université, CNRS, IM2NP UMR 7334, Marseille 13397, France
| | - Christophe Decroos
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
| | - A Jalila Simaan
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Maylis Orio
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
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4
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EPR Spectroscopy of Cu(II) Complexes: Prediction of g-Tensors Using Double-Hybrid Density Functional Theory. MAGNETOCHEMISTRY 2022. [DOI: 10.3390/magnetochemistry8040036] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Computational electron paramagnetic resonance (EPR) spectroscopy is an important field of applied quantum chemistry that contributes greatly to connecting spectroscopic observations with the fundamental description of electronic structure for open-shell molecules. However, not all EPR parameters can be predicted accurately and reliably for all chemical systems. Among transition metal ions, Cu(II) centers in inorganic chemistry and biology, and their associated EPR properties such as hyperfine coupling and g-tensors, pose exceptional difficulties for all levels of quantum chemistry. In the present work, we approach the problem of Cu(II) g-tensor calculations using double-hybrid density functional theory (DHDFT). Using a reference set of 18 structurally and spectroscopically characterized Cu(II) complexes, we evaluate a wide range of modern double-hybrid density functionals (DHDFs) that have not been applied previously to this problem. Our results suggest that the current generation of DHDFs consistently and systematically outperform other computational approaches. The B2GP-PLYP and PBE0-DH functionals are singled out as the best DHDFs on average for the prediction of Cu(II) g-tensors. The performance of the different functionals is discussed and suggestions are made for practical applications and future methodological developments.
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5
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Deshpande MS, Morajkar SM, Ahirwar MB, Deshmukh MM, Srinivasan BR. Synthesis, structural, and DFT studies of mixed ligand copper(II) malonates. J CHEM SCI 2021. [DOI: 10.1007/s12039-021-01947-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Petrenko YP, Piasta K, Khomenko DM, Doroshchuk RO, Shova S, Novitchi G, Toporivska Y, Gumienna-Kontecka E, Martins LMDRS, Lampeka RD. An investigation of two copper(ii) complexes with a triazole derivative as a ligand: magnetic and catalytic properties. RSC Adv 2021; 11:23442-23449. [PMID: 35479774 PMCID: PMC9036593 DOI: 10.1039/d1ra03107d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/24/2021] [Indexed: 12/13/2022] Open
Abstract
Two new copper(ii) complexes [Cu2(L)2(OAc)2(H2O)2] (1) (L = 3-methyl-5-pyridin-2-yl-1,2,4-triazole) and [CuL2] (2) were prerared and thoroughly studied. The complexes are able to selectively catalyze the oxidation of styrene towards benzaldehyde and of cyclohexane to KA oil. The 2D coordination polymer 1 showed an antiferromagnetic behaviour attributed to the intrachain magnetic coupling.
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Affiliation(s)
- Yuliia P Petrenko
- Department of Chemistry, Taras Shevchenko National University of Kyiv Volodymyrska Street, 64/13 Kyiv 01601 Ukraine
| | - Karolina Piasta
- Faculty of Chemistry, University of Wroclaw F. Joliot-Curie 14 50-383 Wroclaw Poland
| | - Dmytro M Khomenko
- Department of Chemistry, Taras Shevchenko National University of Kyiv Volodymyrska Street, 64/13 Kyiv 01601 Ukraine
| | - Roman O Doroshchuk
- Department of Chemistry, Taras Shevchenko National University of Kyiv Volodymyrska Street, 64/13 Kyiv 01601 Ukraine
| | - Sergiu Shova
- "Petru Poni" Institute of Macromolecular Chemistry, Laboratory of Inorganic Polymers Aleea Grigore Ghica Voda No. 41A RO-700487 Iasi Romania
| | - Ghénadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes 25 rue des Martyrs, B.P. 166 38042 Grenoble Cedex 9 France
| | - Yuliya Toporivska
- Faculty of Chemistry, University of Wroclaw F. Joliot-Curie 14 50-383 Wroclaw Poland
| | | | - Luísa M D R S Martins
- Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa Av. Rovisco Pais 1049-001 Lisboa Portugal
| | - Rostyslav D Lampeka
- Department of Chemistry, Taras Shevchenko National University of Kyiv Volodymyrska Street, 64/13 Kyiv 01601 Ukraine
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7
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Butsch K, Haseloer A, Schmitz S, Ott I, Schur J, Klein A. Fe III, Cu II and Zn II Complexes of the Rigid 9-Oxido-phenalenone Ligand-Spectroscopy, Electrochemistry, and Cytotoxic Properties. Int J Mol Sci 2021; 22:3976. [PMID: 33921452 PMCID: PMC8070161 DOI: 10.3390/ijms22083976] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/07/2021] [Accepted: 04/07/2021] [Indexed: 01/10/2023] Open
Abstract
The three complexes [Fe(opo)3], [Cu(opo)2], and [Zn(opo)2] containing the non-innocent anionic ligand opo- (opo- = 9-oxido-phenalenone, Hopo = 9-hydroxyphenalonone) were synthesised from the corresponding acetylacetonates. [Zn(opo)2] was characterised using 1H nuclear magnetic resonance (NMR) spectroscopy, the paramagnetic [Fe(opo)3] and [Cu(opo)2] by electron paramagnetic resonance (EPR) spectroscopy. While the EPR spectra of [Cu(opo)2] and [Cu(acac)2] in dimethylformamide (DMF) solution are very similar, a rather narrow spectrum was observed for [Fe(opo)3] in tetrahydrofuran (THF) solution in contrast to the very broad spectrum of [Fe(acac)3] in THF (Hacac = acetylacetone, 2,4-pentanedione; acac- = acetylacetonate). The narrow, completely isotropic signal of [Fe(opo)3] disagrees with a metal-centred S = 5/2 spin system that is observed in the solid state. We assume spin-delocalisation to the opo ligand in the sense of an opo- to FeIII electron transfer. All compounds show several electrochemical opo-centred reduction waves in the range of -1 to -3 V vs. the ferrocene/ferrocenium couple. However, for CuII and FeIII the very first one-electron reductions are metal-centred. Electronic absorption in the UV to vis range are due to π-π* transitions in the opo core, giving Hopo and [Zn(opo)2] a yellow to orange colour. The structured bands ranging from 400 to 500 for all compounds are assigned to the lowest energy π-π* transitions. They show markedly higher intensities and slight shifts for the CuII (brown) and FeIII (red) complexes and we assume admixing metal contributions (MLCT for CuII, LMCT for FeIII). For both complexes long-wavelength absorptions assignable to d-d transitions were detected. Detailed spectroelectrochemical experiments confirm both the electrochemical and the optical assignments. Hopo and the complexes [Cu(opo)2], [Zn(opo)2], and [Fe(opo)3] show antiproliferative activities against HT-29 (colon cancer) and MCF-7 (breast cancer) cell lines in the range of a few µM, comparable to cisplatin under the same conditions.
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Affiliation(s)
- Katharina Butsch
- Department für Chemie, Institut für Anorganische Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany; (K.B.); (A.H.); (S.S.)
| | - Alexander Haseloer
- Department für Chemie, Institut für Anorganische Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany; (K.B.); (A.H.); (S.S.)
| | - Simon Schmitz
- Department für Chemie, Institut für Anorganische Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany; (K.B.); (A.H.); (S.S.)
| | - Ingo Ott
- Institute of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstrasse 55, D-38106 Braunschweig, Germany; (I.O.); (J.S.)
| | - Julia Schur
- Institute of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstrasse 55, D-38106 Braunschweig, Germany; (I.O.); (J.S.)
| | - Axel Klein
- Department für Chemie, Institut für Anorganische Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany; (K.B.); (A.H.); (S.S.)
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8
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Nie H, Schauser NS, Self JL, Tabassum T, Oh S, Geng Z, Jones SD, Zayas MS, Reynolds VG, Chabinyc ML, Hawker CJ, Han S, Bates CM, Segalman RA, Read de Alaniz J. Light-Switchable and Self-Healable Polymer Electrolytes Based on Dynamic Diarylethene and Metal-Ion Coordination. J Am Chem Soc 2021; 143:1562-1569. [PMID: 33439016 DOI: 10.1021/jacs.0c11894] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Self-healing polymer electrolytes are reported with light-switchable conductivity based on dynamic N-donor ligand-containing diarylethene (DAE) and multivalent Ni2+ metal-ion coordination. Specifically, a polystyrene polymer grafted with poly(ethylene glycol-r-DAE)acrylate copolymer side chains was effectively cross-linked with nickel(II) bis(trifluoromethanesulfonimide) (Ni(TFSI)2) salts to form a dynamic network capable of self-healing with fast exchange kinetics under mild conditions. Furthermore, as a photoswitching compound, the DAE undergoes a reversible structural and electronic rearrangement that changes the binding strength of the DAE-Ni2+ complex under irradiation. This can be observed in the DAE-containing polymer electrolyte where irradiation with UV light triggers an increase in the resistance of solid films, which can be recovered with subsequent visible light irradiation. The increase in resistance under UV light irradiation indicates a decrease in ion mobility after photoswitching, which is consistent with the stronger binding strength of ring-closed DAE isomers with Ni2+. 1H-15N heteronuclear multiple-bond correlation nuclear magnetic resonance (HMBC NMR) spectroscopy, continuous wave electron paramagnetic resonance (cw EPR) spectroscopy, and density functional theory (DFT) calculations confirm the increase in binding strength between ring-closed DAE with metals. Rheological and in situ ion conductivity measurements show that these polymer electrolytes efficiently heal to recover their mechanical properties and ion conductivity after damage, illustrating potential applications in smart electronics.
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Affiliation(s)
- Hui Nie
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | | | - Jeffrey L Self
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Tarnuma Tabassum
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Saejin Oh
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | | | - Seamus D Jones
- Department of Chemical Engineering, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Manuel S Zayas
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | | | | | - Craig J Hawker
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Songi Han
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States.,Department of Chemical Engineering, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Christopher M Bates
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Rachel A Segalman
- Department of Chemical Engineering, University of California-Santa Barbara, Santa Barbara, California 93106, United States
| | - Javier Read de Alaniz
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93106, United States
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9
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King TL, Esarte Palomero O, Grimes DA, Goralski ST, Jones RA, Que EL. Modulating extraction and retention of fluorinated β-diketonate metal complexes in perfluorocarbons through the use of non-fluorinated neutral ligands. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00817j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Extraction of metal ions into perfluorocarbon solvent with a fluorinated acac ligand is described as well as synergistic extraction with neutral nitrogen donor ligands. Applications include catalysis, nuclear fuels reprocessing, and medical imaging.
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Affiliation(s)
- Tyler L. King
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, Texas 78712, USA
| | - Orhi Esarte Palomero
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, Texas 78712, USA
| | - Dawson A. Grimes
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, Texas 78712, USA
| | - Sean T. Goralski
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, Texas 78712, USA
| | - Richard A. Jones
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, Texas 78712, USA
| | - Emily L. Que
- Department of Chemistry, The University of Texas at Austin, 105 E. 24th St Stop A5300, Austin, Texas 78712, USA
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10
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Gómez-Piñeiro RJ, Pantazis DA, Orio M. Comparison of Density Functional and Correlated Wave Function Methods for the Prediction of Cu(II) Hyperfine Coupling Constants. Chemphyschem 2020; 21:2667-2679. [PMID: 33201578 PMCID: PMC7756273 DOI: 10.1002/cphc.202000649] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/13/2020] [Indexed: 12/19/2022]
Abstract
The reliable prediction of Cu(II) hyperfine coupling constants remains a challenge for quantum chemistry. Until recently only density functional theory (DFT) could target this property for systems of realistic size. However, wave function based methods become increasingly applicable. In the present work, we define a large set of Cu(II) complexes with experimentally known hyperfine coupling constants and use it to investigate the performance of modern quantum chemical methods for the prediction of this challenging spectroscopic parameter. DFT methods are evaluated against orbital‐optimized second‐order Møller‐Plesset (OO‐MP2) theory and coupled cluster calculations including singles and doubles excitations, driven by the domain‐based local pair natural orbital approach (DLPNO‐CCSD). Special attention is paid to the definition of a basis set that converges adequately toward the basis set limit for the given property for all methods considered in this study, and a specifically optimized basis set is proposed for this purpose. The results suggest that wave function based methods can supplant but do not outcompete DFT for the calculation of Cu(II) hyperfine coupling constants. Mainstream hybrid functionals such as B3PW91 remain on average the best choice.
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Affiliation(s)
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Maylis Orio
- Aix-Marseille Université, CNRS, iSm2, Marseille, France
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11
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A trade-off for covalent and intercalation binding modes: a case study for Copper (II) ions and singly modified DNA nucleoside. Sci Rep 2019; 9:12602. [PMID: 31467417 PMCID: PMC6715747 DOI: 10.1038/s41598-019-48935-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 07/29/2019] [Indexed: 12/03/2022] Open
Abstract
Selective binding to nucleic acids and, more generally, to biopolymers, very often requires at a minimum the presence of specific functionalities and precise spatial arrangement. DNA can fold into defined 3D structures upon binding to metal centers and/or lanthanides. Binding efficiency can be boosted by modified nucleosides incorporated into DNA sequences. In this work the high selectivity of modified nucleosides towards copper (II) ions, when used in the monomeric form, is unexpectedly and drastically reduced upon being covalently attached to the DNA sequence in single-site scenario. Surprisingly, such selectivity is partially retained upon non-covalent (i.e. intercalation) mixture formed by native DNA duplex and a nucleoside in the monomeric form. Exploiting the electron spin properties of such different and rich binding mode scenarios, 1D/2D pulsed EPR experiments have been used and tailored to differentiate among the different modes. An unusual correlation of dispersion of hyperfine couplings and strength of the binding mode(s) is described.
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Macías MA, Elejalde NR, Butassi E, Zacchino S, Portilla J. Studies via X-ray analysis on intermolecular interactions and energy frameworks based on the effects of substituents of three 4-aryl-2-methyl-1H-imidazoles of different electronic nature and their in vitro antifungal evaluation. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:1447-1458. [PMID: 30398201 DOI: 10.1107/s2053229618014109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 10/05/2018] [Indexed: 11/11/2022]
Abstract
The crystal structures of 2-methyl-4-phenyl-1H-imidazole, C10H10N2, (3a), 4-(4-chlorophenyl)-2-methyl-1H-imidazole hemihydrate, C10H9ClN2·0.5H2O, (3b), and 4-(4-methoxyphenyl)-2-methyl-1H-imidazole, C11H12N2O, (3c), have been analyzed. It was found that the electron-donating/withdrawing tendency of the substituent groups in the aryl ring influence the acid-base properties of the 2-methylimidazole nucleus, changing the strength of the intermolecular N-H...N interactions. This behaviour not only influences the crystal structure but also seems to have an important effect on the antifungal activity. Considering the substituent groups, that is, H in (3a), Cl in (3b) and OMe in (3c), the formation of strong N-H...N connections has the probability (3a) > (3b) > (3c), while compound (3c) proves to be more active than (3a) and (3b) at all concentrations against C. neoformans.
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Affiliation(s)
- Mario A Macías
- Department of Chemistry, Universidad de los Andes, Cra. 1 N 18-A-12, 111711, Bogotá, Colombia
| | - Nerith Rocio Elejalde
- Bioorganic Compounds Research Group, Department of Chemistry, Universidad de los Andes, Carrera 1 No. 18A 10, Bogotá 111711, Colombia
| | - Estefanía Butassi
- Pharmacognosy Area, Faculty of Biochemical and Pharmaceutical Sciences, Universidad Nacional de Rosario, Suipacha 531, 2000-Rosario, Argentina
| | - Susana Zacchino
- Pharmacognosy Area, Faculty of Biochemical and Pharmaceutical Sciences, Universidad Nacional de Rosario, Suipacha 531, 2000-Rosario, Argentina
| | - Jaime Portilla
- Bioorganic Compounds Research Group, Department of Chemistry, Universidad de los Andes, Carrera 1 No. 18A 10, Bogotá 111711, Colombia
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