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Nagelski AL, Ozerov M, Fataftah MS, Krzystek J, Greer SM, Holland PL, Telser J. Electronic Structure of Three-Coordinate Fe II and Co II β-Diketiminate Complexes. Inorg Chem 2024; 63:4511-4526. [PMID: 38408452 DOI: 10.1021/acs.inorgchem.3c03388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
The β-diketiminate supporting group, [ArNCRCHCRNAr]-, stabilizes low coordination number complexes. Four such complexes, where R = tert-butyl, Ar = 2,6-diisopropylphenyl, are studied: (nacnactBu)ML, where M = FeII, CoII and L = Cl, CH3. These are denoted FeCl, FeCH3, CoCl, and CoCH3 and have been previously reported and structurally characterized. The two FeII complexes (S = 2) have also been previously characterized by Mössbauer spectroscopy, but only indirect assessment of the ligand-field splitting and zero-field splitting (zfs) parameters was available. Here, EPR spectroscopy is used, both conventional field-domain for the CoII complexes (with S = 3/2) and frequency-domain, far-infrared magnetic resonance spectroscopy (FIRMS) for all four complexes. The CoII complexes were also studied by magnetometry. These studies allow accurate determination of the zfs parameters. The two FeII complexes are similar with nearly axial zfs and large magnitude zfs given by D = -37 ± 1 cm-1 for both. The two CoII complexes likewise exhibit large and nearly axial zfs, but surprisingly, CoCl has positive D = +55 cm-1 while CoCH3 has negative D = -49 cm-1. Theoretical methods were used to probe the electronic structures of the four complexes, which explain the experimental spectra and the zfs parameters.
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Affiliation(s)
- Alexandra L Nagelski
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Majed S Fataftah
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Samuel M Greer
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Patrick L Holland
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
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2
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Pérez AL, Kemmerer A, Zapata AJ, Sartoris R, Gonzalez PJ, Urteaga R, Baggio R, Suarez S, Ramos CA, Dalosto SD, Rizzi AC, Brondino CD. Synthesis, structure, and characterisation of a ferromagnetically coupled dinuclear complex containing Co(II) ions in a high spin configuration and thiodiacetate and phenanthroline as ligands and of a series of isomorphous heterodinuclear complexes containing different Co : Zn ratios. Dalton Trans 2023; 52:14595-14605. [PMID: 37786344 DOI: 10.1039/d3dt02115g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
We report the synthesis, crystal structure, and characterisation of a dinuclear Co(II) compound with thiodiacetate (tda) and phenanthroline (phen) as ligands (1), and of a series of metal complexes isomorphous to 1 with different Co : Zn ratios (2, 4 : 1; 3, 1 : 1; 4, 1 : 4; 5, 1 : 10). General characterisation methodologies and X-ray data showed that all the synthesised complexes are isomorphous to Zn(II) and Cu(II) analogues (CSD codes: DUHXEL and BEBQII). 1 consists of centrosymmetric Co(II) ion dimers in which the ions are 3.214 Å apart, linked by two μ-O bridges. Each cobalt atom is in a distorted octahedral environment of the N2O3S type. UV-vis spectra of 1 and 5 are in line with high spin (S = 3/2) Co(II) ions in octahedral coordination and indicate that the electronic structure of both Co(II) ions in the dinuclear unit does not significantly change relative to that of the magnetically isolated Co(II) ion. EPR spectra of powder samples of 5 (Co : Zn ratio of 1 : 10) together with spectral simulation indicated high spin Co(II) ions with high rhombic distortion of the zfs [E/D = 0.31(1), D > 0]. DC magnetic susceptibility experiments on 1 and analysis of the data constraining the E/D value obtained by EPR yielded g = 2.595(7), |D| = 61(1) cm-1, and an intradimer ferromagnetic exchange coupling of J = 1.39(4) cm-1. EPR spectra as a function of Co : Zn ratio for both powder and single crystal samples confirmed that they result from two effective S' = 1/2 spins that interact through dipolar and isotropic exchange interactions to yield magnetically isolated S' = 1 centres and that interdimeric exchange interactions, putatively mediated by hydrophobic interactions between phen moieties, are negligible. The latter observation contrasts with that observed in the Cu(II) analogue, where a transition from S = 1 to S' = 1/2 was observed. Computational calculations indicated that the absence of the interdimeric exchange interaction in 1 is due to a lower Co(II) ion spin density delocalisation towards the metal ligands.
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Affiliation(s)
- Ana L Pérez
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
- Instituto de Física del Litoral, Universidad Nacional del Litoral - CONICET, Güemes 3450, 3000 Santa Fe, Argentina
| | - Axel Kemmerer
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Alejandro J Zapata
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Rosana Sartoris
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Pablo J Gonzalez
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Raul Urteaga
- Instituto de Física del Litoral, Universidad Nacional del Litoral - CONICET, Güemes 3450, 3000 Santa Fe, Argentina
- Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina
| | - Ricardo Baggio
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Sebastián Suarez
- Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina
| | - Carlos A Ramos
- Instituto de Nanociencia y Nanotecnología, CNEA-CONICET, Centro Atómico Bariloche, 8400, San Carlos de Bariloche, Río Negro, Argentina
| | - Sergio D Dalosto
- Instituto de Física del Litoral, Universidad Nacional del Litoral - CONICET, Güemes 3450, 3000 Santa Fe, Argentina
- Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina
| | - Alberto C Rizzi
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
| | - Carlos D Brondino
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral and CONICET, Ciudad Universitaria, S3000ZAA Santa Fe, Argentina.
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3
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Usevičius G, Eggeling A, Pocius I, Kalendra V, Klose D, Mączka M, Pöppl A, Banys J, Jeschke G, Šimėnas M. Probing Methyl Group Tunneling in [(CH 3) 2NH 2][Zn(HCOO) 3] Hybrid Perovskite Using Co 2+ EPR. Molecules 2023; 28:molecules28030979. [PMID: 36770643 PMCID: PMC9920925 DOI: 10.3390/molecules28030979] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/14/2023] [Accepted: 01/16/2023] [Indexed: 01/21/2023] Open
Abstract
At low temperature, methyl groups act as hindered quantum rotors exhibiting rotational quantum tunneling, which is highly sensitive to a local methyl group environment. Recently, we observed this effect using pulsed electron paramagnetic resonance (EPR) in two dimethylammonium-containing hybrid perovskites doped with paramagnetic Mn2+ ions. Here, we investigate the feasibility of using an alternative fast-relaxing Co2+ paramagnetic center to study the methyl group tunneling, and, as a model compound, we use dimethylammonium zinc formate [(CH3)2NH2][Zn(HCOO)3] hybrid perovskite. Our multifrequency (X-, Q- and W-band) EPR experiments reveal a high-spin state of the incorporated Co2+ center, which exhibits fast spin-lattice relaxation and electron spin decoherence. Our pulsed EPR experiments reveal magnetic field independent electron spin echo envelope modulation (ESEEM) signals, which are assigned to the methyl group tunneling. We use density operator simulations to extract the tunnel frequency of 1.84 MHz from the experimental data, which is then used to calculate the rotational barrier of the methyl groups. We compare our results with the previously reported Mn2+ case showing that our approach can detect very small changes in the local methyl group environment in hybrid perovskites and related materials.
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Affiliation(s)
- Gediminas Usevičius
- Faculty of Physics, Vilnius University, Sauletekio 3, 10257 Vilnius, Lithuania
| | - Andrea Eggeling
- Department of Physical Chemistry, ETH-Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Ignas Pocius
- Faculty of Physics, Vilnius University, Sauletekio 3, 10257 Vilnius, Lithuania
| | - Vidmantas Kalendra
- Faculty of Physics, Vilnius University, Sauletekio 3, 10257 Vilnius, Lithuania
| | - Daniel Klose
- Department of Physical Chemistry, ETH-Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Mirosław Mączka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wroclaw, Poland
| | - Andreas Pöppl
- Felix Bloch Institute for Solid State Physics, Leipzig University, 04103 Leipzig, Germany
| | - Jūras Banys
- Faculty of Physics, Vilnius University, Sauletekio 3, 10257 Vilnius, Lithuania
| | - Gunnar Jeschke
- Department of Physical Chemistry, ETH-Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Mantas Šimėnas
- Faculty of Physics, Vilnius University, Sauletekio 3, 10257 Vilnius, Lithuania
- Correspondence:
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Novitchi G, Shova S, Train C. Investigation by Chemical Substitution within 2p-3d-4f Clusters of the Cobalt(II) Role in the Magnetic Behavior of [vdCoLn] 2 (vd = Verdazyl Radical). Inorg Chem 2022; 61:17037-17048. [PMID: 36240010 DOI: 10.1021/acs.inorgchem.2c01742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
1,5-Dimethyl-3-(3'-(hydroxymethyl)-2'-pyridine)-6-oxotetrazane (H3vdpyCH2OH) or its oxidized verdazyl form (vdpyCH2OH) reacted with transition metal and/or lanthanide acetates to yield [(vdpyCH2O)2Co2Ln2(acO)8] (Ln = Y(III): ICo,Y; Gd(III): ICo,Gd), [(vdpyCH2O)2M3(acO)4] (M = Zn(II): IIZn; Co(II): IICo) and [(vdpyCH2OH)Zn(acO)2] (IIIZn) through self-assembly implying a complex-as-ligand intermediate. Single-crystal diffraction reveals that IMT,Ln are composed of 2p-3d-4f centrosymmetric clusters with verdazyl radicals at the two ends coordinated to the transition-metal ion in a tridentate mode and to the {Ln2(acO)4} lanthanide central core in a monodentate mode through its alkoxo moiety. In ICo,Gd, the transition-metal ions adopt an irregular octahedral environment, and the {Ln2(acO)4} core adopts a paddlewheel motif, whereas in ICo,Y, the transition metal is pentacoordinated, and the central core contains only two acetate bridges. Going from ICo,Y to IICo, the central {Y2(acO)4} core is replaced by an axially compressed octahedral cobalt(II) center, whereas the outer parts of the molecule remain still. The dc magnetic studies revealed that the alternate π-stacking of the verdazyl radicals in IIZn led to the formation of alternate antiferromagnetically coupled 1D chains with Jvd-vd = -8.2(1) cm-1 and Jvd-vd' = -7.6(1) cm-1 (-2J convention). In ICo,Y, a complex fitting procedure allowed us to retrieve a complete set of magnetic parameters to take into account both the magnetic anisotropy of the cobalt(II) centers and intra- and inter-molecular exchange effects. For ICo,Y, it led to gCo = 2.13(4), DCo = 100(2) cm-1, ECo = 19.9(5) cm-1, JCo-vd = +26.5(4) cm-1, and Jvd-vd = -7.95(4) cm-1. ac magnetic susceptibility of ICo,Y, ICo,Gd and IICo did not reveal any slow relaxation of the magnetization even when a dc external magnetic field up to 2000 Oe was applied.
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Affiliation(s)
- Ghénadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses (LNCMI) Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier, EMFL, CNRS F-38042 Grenoble, France
| | - Sergiu Shova
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Cyrille Train
- Laboratoire National des Champs Magnétiques Intenses (LNCMI) Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier, EMFL, CNRS F-38042 Grenoble, France
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5
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Taylor RL, Housley D, Barter M, Porch A, Whiston K, Folli A, Murphy DM. The influence of solvent composition on the coordination environment of the Co/Mn/Br based para-xylene oxidation catalyst as revealed by EPR and ESEEM spectroscopy. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00496h] [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
The industrially important para-xylene oxidation reaction, based on a Co/Mn/Br catalyst, operates in a water/acetic acid (H2O/AcOH) solvent system.
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Affiliation(s)
- Rebekah L. Taylor
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Duncan Housley
- The Wilton Centre, Koch Technology Solutions Ltd., Wilton, Redcar, TS10 4RE, UK
| | - Michael Barter
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - Adrian Porch
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - Keith Whiston
- The Wilton Centre, Koch Technology Solutions Ltd., Wilton, Redcar, TS10 4RE, UK
| | - Andrea Folli
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Damien M. Murphy
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
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6
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Kalra A, Bagchi V, Paraskevopoulou P, Das P, Ai L, Sanakis Y, Raptopoulos G, Mohapatra S, Choudhury A, Sun Z, Cundari TR, Stavropoulos P. Is the Electrophilicity of the Metal Nitrene the Sole Predictor of Metal-Mediated Nitrene Transfer to Olefins? Secondary Contributing Factors as Revealed by a Library of High-Spin Co(II) Reagents. Organometallics 2021; 40:1974-1996. [PMID: 35095166 PMCID: PMC8797515 DOI: 10.1021/acs.organomet.1c00267] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Recent research has highlighted the key role played by the electron affinity of the active metal-nitrene/imido oxidant as the driving force in nitrene additions to olefins to afford valuable aziridines. The present work showcases a library of Co(II) reagents that, unlike the previously examined Mn(II) and Fe(II) analogues, demonstrate reactivity trends in olefin aziridinations that cannot be solely explained by the electron affinity criterion. A family of Co(II) catalysts (17 members) has been synthesized with the assistance of a trisphenylamido-amine scaffold decorated by various alkyl, aryl, and acyl groups attached to the equatorial amidos. Single-crystal X-ray diffraction analysis, cyclic voltammetry and EPR data reveal that the high-spin Co(II) sites (S = 3/2) feature a minimal [N3N] coordination and span a range of 1.4 V in redox potentials. Surprisingly, the Co(II)-mediated aziridination of styrene demonstrates reactivity patterns that deviate from those anticipated by the relevant electrophilicities of the putative metal nitrenes. The representative L4Co catalyst (-COCMe3 arm) is operating faster than the L8Co analogue (-COCF3 arm), in spite of diminished metal-nitrene electrophilicity. Mechanistic data (Hammett plots, KIE, stereocontrol studies) reveal that although both reagents follow a two-step reactivity path (turnover-limiting metal-nitrene addition to the C b atom of styrene, followed by product-determining ring-closure), the L4Co catalyst is associated with lower energy barriers in both steps. DFT calculations indicate that the putative [L4Co]NTs and [L8Co]NTs species are electronically distinct, inasmuch as the former exhibits a single-electron oxidized ligand arm. In addition, DFT calculations suggest that including London dispersion corrections for L4Co (due to the polarizability of the tert-Bu substituent) can provide significant stabilization of the turnover-limiting transition state. This study highlights how small ligand modifications can generate stereoelectronic variants that in certain cases are even capable of overriding the preponderance of the metal-nitrene electrophilicity as a driving force.
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Affiliation(s)
- Anshika Kalra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Vivek Bagchi
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States; Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Patrina Paraskevopoulou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Purak Das
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Lin Ai
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States; College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Yiannis Sanakis
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, NCSR "Demokritos", Athens 15310, Greece
| | - Grigorios Raptopoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Athens 15771, Greece
| | - Sudip Mohapatra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Amitava Choudhury
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Zhicheng Sun
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - Thomas R Cundari
- Department of Chemistry, Center for Advanced Scientific Computing and Modeling (CASCaM), University of North Texas, Denton, Texas 76203, United States
| | - Pericles Stavropoulos
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
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7
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Bone AN, Widener CN, Moseley DH, Liu Z, Lu Z, Cheng Y, Daemen LL, Ozerov M, Telser J, Thirunavukkuarasu K, Smirnov D, Greer SM, Hill S, Krzystek J, Holldack K, Aliabadi A, Schnegg A, Dunbar KR, Xue ZL. Applying Unconventional Spectroscopies to the Single-Molecule Magnets, Co(PPh 3 ) 2 X 2 (X=Cl, Br, I): Unveiling Magnetic Transitions and Spin-Phonon Coupling. Chemistry 2021; 27:11110-11125. [PMID: 33871890 DOI: 10.1002/chem.202100705] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Indexed: 11/11/2022]
Abstract
Large separation of magnetic levels and slow relaxation in metal complexes are desirable properties of single-molecule magnets (SMMs). Spin-phonon coupling (interactions of magnetic levels with phonons) is ubiquitous, leading to magnetic relaxation and loss of memory in SMMs and quantum coherence in qubits. Direct observation of magnetic transitions and spin-phonon coupling in molecules is challenging. We have found that far-IR magnetic spectra (FIRMS) of Co(PPh3 )2 X2 (Co-X; X=Cl, Br, I) reveal rarely observed spin-phonon coupling as avoided crossings between magnetic and u-symmetry phonon transitions. Inelastic neutron scattering (INS) gives phonon spectra. Calculations using VASP and phonopy programs gave phonon symmetries and movies. Magnetic transitions among zero-field split (ZFS) levels of the S=3/2 electronic ground state were probed by INS, high-frequency and -field EPR (HFEPR), FIRMS, and frequency-domain FT terahertz EPR (FD-FT THz-EPR), giving magnetic excitation spectra and determining ZFS parameters (D, E) and g values. Ligand-field theory (LFT) was used to analyze earlier electronic absorption spectra and give calculated ZFS parameters matching those from the experiments. DFT calculations also gave spin densities in Co-X, showing that the larger Co(II) spin density in a molecule, the larger its ZFS magnitude. The current work reveals dynamics of magnetic and phonon excitations in SMMs. Studies of such couplings in the future would help to understand how spin-phonon coupling may lead to magnetic relaxation and develop guidance to control such coupling.
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Affiliation(s)
- Alexandria N Bone
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
| | - Chelsea N Widener
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
| | - Duncan H Moseley
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
| | - Zhiming Liu
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
| | - Zhengguang Lu
- National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA
| | - Yongqiang Cheng
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Luke L Daemen
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA
| | - Joshua Telser
- Department of Biological, Physical and Chemical Sciences, Roosevelt University, Chicago, Illinois, 60605, USA
| | | | - Dmitry Smirnov
- National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA
| | - Samuel M Greer
- National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA.,Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida, 32306, USA
| | - Stephen Hill
- National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA.,Department of Physics, Florida State University, Tallahassee, Florida, 32306, USA
| | - J Krzystek
- National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA
| | - Karsten Holldack
- Helmholtz-Zentrum Berlin für Materialien und Energie Gmbh, Institut für Methoden und Instrumente der Forschung mit Synchrotronstrahlung, 12489, Berlin, Germany
| | - Azar Aliabadi
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Nanospektroskopie, Berlin Joint EPR Laboratory, 12489, Berlin, Germany
| | - Alexander Schnegg
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Nanospektroskopie, Berlin Joint EPR Laboratory, 12489, Berlin, Germany.,Max Planck Institute for Chemical Energy Conversion, 45470, Mülheim an der Ruhr, Germany
| | - Kim R Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas, 77842, USA
| | - Zi-Ling Xue
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
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8
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An Y, Lu L, Zhu M, van Leusen J, Englert U. Homologous series of coordination polymers based on semi-rigid tricarboxylato-bridged Co2+/Ni2+: Syntheses, structures, and magnetic properties. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Peng A, Kung MC, Ross MO, Hoffman BM, Kung HH. The Role of Co-ZSM-5 Catalysts in Aerobic Oxidation of Ethylbenzene. Top Catal 2020. [DOI: 10.1007/s11244-020-01305-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Ferromagnetically-coupled, triangular, [Bu4N]2[CuII3(μ3-Br)2(μ-4-O2N-pz)3Br3] complex revisited: The effect of coordinated halides on spin relaxation properties. Polyhedron 2020. [DOI: 10.1016/j.poly.2019.114258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Peters M, Baabe D, Maekawa M, Bockfeld D, Zaretzke MK, Tamm M, Walter MD. Pogo-Stick Iron and Cobalt Complexes: Synthesis, Structures, and Magnetic Properties. Inorg Chem 2019; 58:16475-16486. [PMID: 31769666 DOI: 10.1021/acs.inorgchem.9b02411] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis, structures, and magnetic properties of monomeric half-sandwich iron and cobalt imidazolin-2-iminato complexes have been comprehensively investigated. Salt metathesis reactions of [Cp'M(μ-I)]2 (1-M, M = Fe, Co; Cp' = η5-1,2,4-tri-tert-butylcyclopentadienyl) with [ImDippNLi]2 (ImDippN = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-iminato) furnishes the terminal half-sandwich compounds [Cp'M(NImDipp)] (2-M, M = Fe, Co), which can be regarded as models for elusive half-sandwich iron and cobalt imido complexes. X-ray diffraction analysis confirmed the structure motif of a one-legged piano stool. Complex 2-Co can also be prepared by an acid-base reaction between [Cp'Co{N(SiMe3)2}] (3-Co) and ImDippNH. The electronic and magnetic properties of 2-M and 3-Co were probed by 57Fe Mössbauer spectroscopy (M = Fe), X-band EPR spectroscopy (M = Co), and solid-state magnetic susceptibility measurements. In particular, the central metal atom adopts a high-spin (S = 2) state in 2-Fe, while the cobalt complex 2-Co represents a rare example of a Co(II) species with a coordination number different from six displaying a low-spin to high-spin spin-crossover (SCO) behavior. The experimental observations are complemented by DFT calculations.
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Affiliation(s)
- Marius Peters
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Dirk Baabe
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Miyuki Maekawa
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Marc-Kevin Zaretzke
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Marc D Walter
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
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12
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Wu XS, Bao HF, Zhu FL, Sun J, Wang XL, Su ZM. Syntheses and magnetic properties of high-dimensional cucurbit[6]uril-based metal-organic rotaxane frameworks. Dalton Trans 2019; 48:9939-9943. [PMID: 31204763 DOI: 10.1039/c9dt01544b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Three new high-dimensional cucurbit[6]-based metal-organic rotaxane frameworks [Co2(PR43)(BDC)2Cl2]·4H2O (1), [Co2(PR43)(BTC)2]·6H2O (2) and [Co2(PR43)(BPT)2]·20H2O (3) were obtained via the hydrothermal synthesis method. Compound 1 comprised a two-dimensional layered structure, while compounds 2 and 3 exhibited three-dimensional pillared structures. All the compounds showed good thermal stabilities. Furthermore, the magnetic properties of compounds 1-3 were also investigated in detail.
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Affiliation(s)
- Xue-Song Wu
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, P. R. China.
| | - Hong-Fei Bao
- National & Local United Engineering Laboratory for Power Battery Institution, Northeast Normal University, Changchun, Jilin 130024, P.R. China
| | - Fu-Long Zhu
- National & Local United Engineering Laboratory for Power Battery Institution, Northeast Normal University, Changchun, Jilin 130024, P.R. China
| | - Jing Sun
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, P. R. China.
| | - Xin-Long Wang
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, P. R. China. and National & Local United Engineering Laboratory for Power Battery Institution, Northeast Normal University, Changchun, Jilin 130024, P.R. China
| | - Zhong-Min Su
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, P. R. China. and National & Local United Engineering Laboratory for Power Battery Institution, Northeast Normal University, Changchun, Jilin 130024, P.R. China
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13
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Galle LM, Cutsail Iii GE, Nischwitz V, DeBeer S, Span I. Spectroscopic characterization of the Co-substituted C-terminal domain of rubredoxin-2. Biol Chem 2018; 399:787-798. [PMID: 29894292 DOI: 10.1515/hsz-2018-0142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/25/2018] [Indexed: 11/15/2022]
Abstract
Pseudomonas putida rubredoxin-2 (Rxn2) is an essential member of the alkane hydroxylation pathway and transfers electrons from a reductase to the membrane-bound hydroxylase. The regioselective hydroxylation of linear alkanes is a challenging chemical transformation of great interest for the chemical industry. Herein, we report the preparation and spectroscopic characterization of cobalt-substituted P. putida Rxn2 and a truncated version of the protein consisting of the C-terminal domain of the protein. Our spectroscopic data on the Co-substituted C-terminal domain supports a high-spin Co(II) with a distorted tetrahedral coordination environment. Investigation of the two-domain protein Rxn2 provides insights into the metal-binding properties of the N-terminal domain, the role of which is not well understood so far. Circular dichroism, electron paramagnetic resonance and X-ray absorption spectroscopies support an alternative Co-binding site within the N-terminal domain, which appears to not be relevant in nature. We have shown that chemical reconstitution in the presence of Co leads to incorporation of Co(II) into the active site of the C-terminal domain, but not the N-terminal domain of Rxn2 indicating distinct roles for the two rubredoxin domains.
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Affiliation(s)
- Lisa M Galle
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - George E Cutsail Iii
- Max Planck Institute for Chemical Energy Conversion, D-45470 Mülheim an der Ruhr, Germany
| | - Volker Nischwitz
- Central Institute for Engineering, Electronics and Analytics (ZEA-3), Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, D-45470 Mülheim an der Ruhr, Germany
| | - Ingrid Span
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
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14
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Decaneto E, Vasilevskaya T, Kutin Y, Ogata H, Grossman M, Sagi I, Havenith M, Lubitz W, Thiel W, Cox N. Solvent water interactions within the active site of the membrane type I matrix metalloproteinase. Phys Chem Chem Phys 2018; 19:30316-30331. [PMID: 28951896 DOI: 10.1039/c7cp05572b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Matrix metalloproteinases (MMP) are an important family of proteases which catalyze the degradation of extracellular matrix components. While the mechanism of peptide cleavage is well established, the process of enzyme regeneration, which represents the rate limiting step of the catalytic cycle, remains unresolved. This step involves the loss of the newly formed N-terminus (amine) and C-terminus (carboxylate) protein fragments from the site of catalysis coupled with the inclusion of one or more solvent waters. Here we report a novel crystal structure of membrane type I MMP (MT1-MMP or MMP-14), which includes a small peptide bound at the catalytic Zn site via its C-terminus. This structure models the initial product state formed immediately after peptide cleavage but before the final proton transfer to the bound amine; the amine is not present in our system and as such proton transfer cannot occur. Modeling of the protein, including earlier structural data of Bertini and coworkers [I. Bertini, et al., Angew. Chem., Int. Ed., 2006, 45, 7952-7955], suggests that the C-terminus of the peptide is positioned to form an H-bond network to the amine site, which is mediated by a single oxygen of the functionally important Glu240 residue, facilitating efficient proton transfer. Additional quantum chemical calculations complemented with magneto-optical and magnetic resonance spectroscopies clarify the role of two additional, non-catalytic first coordination sphere waters identified in the crystal structure. One of these auxiliary waters acts to stabilize key intermediates of the reaction, while the second is proposed to facilitate C-fragment release, triggered by protonation of the amine. Together these results complete the enzymatic cycle of MMPs and provide new design criteria for inhibitors with improved efficacy.
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Affiliation(s)
- Elena Decaneto
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße. 34-36, D-45470, Mülheim an der Ruhr, Germany.
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15
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Zahariou G. Characterization of the High-Spin Co(II) Intermediate Species of the O2-Evolving Co4O4 Cubic Molecules. Inorg Chem 2017; 56:6105-6113. [DOI: 10.1021/acs.inorgchem.7b00079] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Georgia Zahariou
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
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16
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Suturina EA, Nehrkorn J, Zadrozny JM, Liu J, Atanasov M, Weyhermüller T, Maganas D, Hill S, Schnegg A, Bill E, Long JR, Neese F. Magneto-Structural Correlations in Pseudotetrahedral Forms of the [Co(SPh)4]2– Complex Probed by Magnetometry, MCD Spectroscopy, Advanced EPR Techniques, and ab Initio Electronic Structure Calculations. Inorg Chem 2017; 56:3102-3118. [DOI: 10.1021/acs.inorgchem.7b00097] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elizaveta A. Suturina
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
- Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia
| | - Joscha Nehrkorn
- Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße
5, 12489 Berlin, Germany
| | - Joseph M. Zadrozny
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Junjie Liu
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
| | - Mihail Atanasov
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
- Bulgarian Academy of Sciences, Institute of General and Inorganic
Chemistry, Akad. Georgi
Bontchev Street 11, 1113 Sofia, Bulgaria
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Dimitrios Maganas
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Stephen Hill
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Alexander Schnegg
- Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße
5, 12489 Berlin, Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Jeffrey R. Long
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
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17
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Fliedel C, Rosa V, Vileno B, Parizel N, Choua S, Gourlaouen C, Rosa P, Turek P, Braunstein P. Zwitterionic Cobalt Complexes with Bis(diphenylphosphino)(N-thioether)amine Assembling Ligands: Structural, EPR, Magnetic, and Computational Studies. Inorg Chem 2016; 55:4183-98. [PMID: 27054464 DOI: 10.1021/acs.inorgchem.5b02889] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The coordination of two heterofunctional P,P,S ligands of the N-functionalized DPPA-type bearing an alkylthioether or arylthioether N-substituent, (Ph2P)2N(CH2)3SMe (1) and (Ph2P)2N(p-C6H4)SMe (2), respectively, toward cobalt dichloride was investigated to examine the influence of the linker between the PNP nitrogen and the S atoms. The complexes [CoCl2(1)]2 (3) and [CoCl2(2)]2 (4) have been isolated, and 3 was shown by X-ray diffraction to be a unique dinuclear, zwitterion containing one CoCl moiety bis-chelated by two ligands 1 and one CoCl3 fragment coordinated by the S atom of a thioether function. The FT-IR, UV-vis, and EPR spectroscopic features of 3 were analyzed as the superposition of those of constitutive fragments identified by a retrosynthetic-type analysis. A similar approach provided insight into the nature of 4 for which no X-ray diffraction data could be obtained. A comparison between the spectroscopic features of 4 and of its constitutive fragments, [CoCl(2)2]PF6 (7) and [H2']2[CoCl4] (8) (2' = NH2(p-C6H4)SMe), and between those of 4 and 3 suggested that 4 could either have a zwitterionic structure, similar to that of 3, or contain a tetrahedral dicationic bis-chelated Co center associated with a CoCl4 dianion. Magnetic and EPR studies and theoretical calculations were performed. Doublet spin states were found for the pentacoordinated complexes [CoCl(1)2]PF6 (5) and 7 and anisotropic quadruplet spin states for the tetrahedral complexes [CoCl3(H1')] (6) (1' = NH2(CH2)3SMe) and 8. A very similar behavior was observed for 3 and 4, consisting in the juxtaposition of noninteracting doublet and quadruplet spin states. Antiferromagnetic interactions explain the formation of dimers for 6 and of layers for 8. The EPR signatures of 3 and 4 correspond to the superposition of low-spin nuclei in 5 and 7 and high-spin nuclei in 6 and 8, respectively. From DFT calculations, the solid-state structure of 4 appears best described as zwitterionic, with a low-spin state for the Co1 atom.
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Affiliation(s)
| | | | - Bertrand Vileno
- French EPR Federation of Research (REseau NAtional de Rpe interDisciplinaire, RENARD), Fédération IR-RPE CNRS 3443, 67081 Strasbourg, France
| | | | | | | | - Patrick Rosa
- CNRS, Université de Bordeaux, ICMCB , UPR9048, F-33600 Pessac, France
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18
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Baum RR, Myers WK, Greer SM, Breece RM, Tierney DL. The Original CoII Heteroscorpionates Revisited: On the EPR of Pseudotetrahedral CoII. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Robert R. Baum
- Department of Chemistry and BiochemistryMiami University45056OxfordOHUSA
| | - William K. Myers
- Department of Chemistry and BiochemistryMiami University45056OxfordOHUSA
| | - Samuel M. Greer
- Department of Chemistry and BiochemistryMiami University45056OxfordOHUSA
| | - Robert M. Breece
- Department of Chemistry and BiochemistryMiami University45056OxfordOHUSA
| | - David L. Tierney
- Department of Chemistry and BiochemistryMiami University45056OxfordOHUSA
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19
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Rizzi AC, Neuman NI, González PJ, Brondino CD. EPR as a Tool for Study of Isolated and Coupled Paramagnetic Centers in Coordination Compounds and Macromolecules of Biological Interest. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501111] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Manna P, Tripuramallu BK, Bommakanti S, Das SK. Synthesis, characterization and magnetism of metal–organic compounds: role of the positions of the coordinating groups of a meso-flexible ligand in placing anisotropy to exhibit spin-canting behaviour. Dalton Trans 2015; 44:2852-64. [DOI: 10.1039/c4dt03468f] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Magnetic anisotropy can be included in metal–organic coordination polymers by altering the position of the coordinating groups on the skeleton of the ligand.
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Affiliation(s)
- Paulami Manna
- School of Chemistry
- University of Hyderabad
- P.O. Central University
- Hyderabad
- India
| | | | - Suresh Bommakanti
- School of Chemistry
- University of Hyderabad
- P.O. Central University
- Hyderabad
- India
| | - Samar K. Das
- School of Chemistry
- University of Hyderabad
- P.O. Central University
- Hyderabad
- India
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21
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Nedelko N, Kornowicz A, Justyniak I, Aleshkevych P, Prochowicz D, Krupiński P, Dorosh O, Ślawska-Waniewska A, Lewiński J. Supramolecular Control over Molecular Magnetic Materials: γ-Cyclodextrin-Templated Grid of Cobalt(II) Single-Ion Magnets. Inorg Chem 2014; 53:12870-6. [DOI: 10.1021/ic501870h] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Natalia Nedelko
- Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
| | - Arkadiusz Kornowicz
- Department of Chemistry, Warsaw University of Technology, Noakowskiego
3, 00−664 Warsaw, Poland
| | - Iwona Justyniak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Pavlo Aleshkevych
- Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
| | - Daniel Prochowicz
- Department of Chemistry, Warsaw University of Technology, Noakowskiego
3, 00−664 Warsaw, Poland
| | - Piotr Krupiński
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Orest Dorosh
- National Center for Nuclear Research, ul. Sołtana 7, 05-400 Otwock, Poland
| | - Anna Ślawska-Waniewska
- Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
| | - Janusz Lewiński
- Department of Chemistry, Warsaw University of Technology, Noakowskiego
3, 00−664 Warsaw, Poland
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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22
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Gómez-Coca S, Urtizberea A, Cremades E, Alonso PJ, Camón A, Ruiz E, Luis F. Origin of slow magnetic relaxation in Kramers ions with non-uniaxial anisotropy. Nat Commun 2014; 5:4300. [DOI: 10.1038/ncomms5300] [Citation(s) in RCA: 304] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 06/04/2014] [Indexed: 11/09/2022] Open
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23
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Besold AN, Amick DL, Michel SLJ. A role for hydrogen bonding in DNA recognition by the non-classical CCHHC type zinc finger, NZF-1. MOLECULAR BIOSYSTEMS 2014; 10:1753-6. [PMID: 24820620 DOI: 10.1039/c4mb00246f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The non-classical zinc finger protein, Neural Zinc Finger Factor-1, contains six Cys2His2Cys domains. All three cysteines and the second histidine directly bind Zn(II). Using a combination of mutagenesis, metal coordination and DNA binding studies, we report that the first histidine is involved in a functionally important hydrogen bonding interaction.
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Affiliation(s)
- Angelique N Besold
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201, USA.
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24
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Tripuramallu BK, Manna P, Das SK. Structural library of coordination polymers based on flexible linkers exploiting the role of linker coordination angle: synthesis, structural characterization and magnetic properties. CrystEngComm 2014. [DOI: 10.1039/c3ce42637h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The linker coordination angles observed in the crystal structures of a new series of coordination polymers of flexible linkers, are correlated with their dimensionality and topology.
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Affiliation(s)
| | - Paulami Manna
- School of Chemistry
- University of Hyderabad
- P.O. Central University
- Hyderabad- 500046, India
| | - Samar K. Das
- School of Chemistry
- University of Hyderabad
- P.O. Central University
- Hyderabad- 500046, India
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25
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Rajnák C, Titiš J, Šalitroš I, Boča R, Fuhr O, Ruben M. Zero-field splitting in pentacoordinate Co(II) complexes. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.08.029] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Idešicová M, Titiš J, Krzystek J, Boča R. Zero-Field Splitting in Pseudotetrahedral Co(II) Complexes: a Magnetic, High-Frequency and -Field EPR, and Computational Study. Inorg Chem 2013; 52:9409-17. [DOI: 10.1021/ic400980b] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Monika Idešicová
- Department of Chemistry (FPV), University of SS. Cyril and Methodius, SK-917 01 Trnava,
Slovakia
| | - Ján Titiš
- Department of Chemistry (FPV), University of SS. Cyril and Methodius, SK-917 01 Trnava,
Slovakia
| | - J. Krzystek
- National High
Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Roman Boča
- Department of Chemistry (FPV), University of SS. Cyril and Methodius, SK-917 01 Trnava,
Slovakia
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27
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Gass IA, Tewary S, Nafady A, Chilton NF, Gartshore CJ, Asadi M, Lupton DW, Moubaraki B, Bond AM, Boas JF, Guo SX, Rajaraman G, Murray KS. Observation of Ferromagnetic Exchange, Spin Crossover, Reductively Induced Oxidation, and Field-Induced Slow Magnetic Relaxation in Monomeric Cobalt Nitroxides. Inorg Chem 2013; 52:7557-72. [DOI: 10.1021/ic400565h] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Ian A. Gass
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Subrata Tewary
- Department
of Chemistry, Indian Institute of Technology—Bombay, Powai, Mumbai, India
| | - Ayman Nafady
- Department of Chemistry, King Saud University, P.O. Box 2455, Riyadh−11451, Kingdom of Saudi Arabia
| | | | | | - Mousa Asadi
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - David W. Lupton
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Boujemaa Moubaraki
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Alan M. Bond
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - John F. Boas
- School of Physics, Monash University,
Clayton, Victoria 3800, Australia
| | - Si-Xuan Guo
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Gopalan Rajaraman
- Department
of Chemistry, Indian Institute of Technology—Bombay, Powai, Mumbai, India
| | - Keith S. Murray
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
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28
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Zielazinski EL, Cutsail GE, Hoffman BM, Stemmler TL, Rosenzweig AC. Characterization of a cobalt-specific P(1B)-ATPase. Biochemistry 2012; 51:7891-900. [PMID: 22971227 DOI: 10.1021/bi3006708] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The P(1B)-type ATPases are a ubiquitous family of P-type ATPases involved in the transport of transition metal ions. Divided into subclasses based on sequence characteristics and substrate specificity, these integral membrane transporters play key roles in metal homeostasis, metal tolerance, and the biosynthesis of metalloproteins. The P(1B-4)-ATPases have the simplest architecture of the five P(1B)-ATPase families and have been suggested to play a role in Co(2+) transport. A P(1B-4)-ATPase from Sulfitobacter sp. NAS-14.1, designated sCoaT, has been cloned, expressed, and purified. Activity assays indicate that sCoaT is specific for Co(2+). A single Co(2+) binding site is present, and optical, electron paramagnetic resonance, and X-ray absorption spectroscopic data are consistent with tetrahedral coordination by oxygen and nitrogen ligands, including a histidine and likely a water. Surprisingly, there is no evidence for coordination by sulfur. Mutation of a conserved cysteine residue, Cys 327, in the signature transmembrane Ser-Pro-Cys metal binding motif does not abolish the ATP hydrolysis activity or affect the spectroscopic analysis, establishing that this residue is not involved in the initial Co(2+) binding by sCoaT. In contrast, replacements of conserved transmembrane residues Ser 325, His 657, Glu 658, and Thr 661 with alanine abolish ATP hydrolysis activity and Co(2+) binding, indicating that these residues are necessary for Co(2+) transport. These data represent the first in vitro characterization of a P(1B-4)-ATPase and its Co(2+) binding site.
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Affiliation(s)
- Eliza L Zielazinski
- Departments of Molecular Biosciences and Chemistry, Northwestern University, Evanston, Illinois 60208, USA
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29
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Cobalt(II) Complexes Bearing a Bulky N‐Heterocyclic Carbene for Catalysis of Kumada–Tamao–Corriu Cross‐Coupling Reactions of Aryl Halides. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200095] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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30
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Qu T, Kuang XY, Li YF, Chai RP. Theoretical investigations of the electronic and magnetic structures for the [CoCl4]2− cluster in Cs3CoCl5 crystal. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2010.12.079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Pietrzyk P, Srebro M, Radoń M, Sojka Z, Michalak A. Spin ground state and magnetic properties of cobalt(II): relativistic DFT calculations guided by EPR measurements of bis(2,4-acetylacetonate)cobalt(II)-based complexes. J Phys Chem A 2011; 115:2316-24. [PMID: 21351791 DOI: 10.1021/jp109524t] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The spin ground state of the core ion and structure of the bis(2,4-acetylacetonate)cobalt(II) model complex and its synthetic aqua and ethanol derivatives, Co(acac)(2)L(n), (L = EtOH, H(2)O), were examined by means of density functional theory (DFT) calculations supported by electron paramagnetic resonance (EPR) measurements. Geometry optimizations were carried out for low-spin (doublet) and high-spin (quartet) states. For the Co(acac)(2) complex two possible conformations, a square-planar and a tetrahedral one, were taken into account. For all structures relative energies were calculated with both "pure" and hybrid functionals. The calculated data were complemented with the results of the EPR investigations carried out at liquid helium temperature, allowing for definite assignment of the high-spin state for the Co(acac)(2)(EtOH)(2) complex. However, because of the unresolved spectral features, only effective g-values could be assessed, whereas the zero-field splitting parameters (ZFS) were calculated by means of the spin-orbit mean field (SOMF) relativistic DFT method for which direct spin-spin (SS) and spin-orbit coupling (SOC) contributions were quantified.
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Affiliation(s)
- Piotr Pietrzyk
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland.
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32
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Fielding AJ, Kovaleva EG, Farquhar ER, Lipscomb JD, Que L. A hyperactive cobalt-substituted extradiol-cleaving catechol dioxygenase. J Biol Inorg Chem 2011; 16:341-55. [PMID: 21153851 PMCID: PMC3192431 DOI: 10.1007/s00775-010-0732-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Accepted: 10/27/2010] [Indexed: 11/27/2022]
Abstract
Homoprotocatechuate 2,3-dioxygenase from Brevibacterium fuscum (HPCD) has an Fe(II) center in its active site that can be replaced with Mn(II) or Co(II). Whereas Mn-HPCD exhibits steady-state kinetic parameters comparable to those of Fe-HPCD, Co-HPCD behaves somewhat differently, exhibiting significantly higher [Formula: see text] and k (cat). The high activity of Co-HPCD is surprising, given that cobalt has the highest standard M(III/II) redox potential of the three metals. Comparison of the X-ray crystal structures of the resting and substrate-bound forms of Fe-HPCD, Mn-HPCD, and Co-HPCD shows that metal substitution has no effect on the local ligand environment, the conformational integrity of the active site, or the overall protein structure, suggesting that the protein structure does not differentially tune the potential of the metal center. Analysis of the steady-state kinetics of Co-HPCD suggests that the Co(II) center alters the relative rate constants for the interconversion of intermediates in the catalytic cycle but still allows the dioxygenase reaction to proceed efficiently. When compared with the kinetic data for Fe-HPCD and Mn-HPCD, these results show that dioxygenase catalysis can proceed at high rates over a wide range of metal redox potentials. This is consistent with the proposed mechanism in which the metal mediates electron transfer between the catechol substrate and O(2) to form the postulated [M(II)(semiquinone)superoxo] reactive species. These kinetic differences and the spectroscopic properties of Co-HPCD provide new tools with which to explore the unique O(2) activation mechanism associated with the extradiol dioxygenase family.
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Affiliation(s)
- Andrew J Fielding
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota, 207 Pleasant Street, Minneapolis, MN 55455, USA
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Pannu APS, Kapoor P, Hundal G, Kapoor R, Corbella M, Aliaga-Alcalde N, Hundal MS. Magneto-structural studies of two new cobalt(ii)-N,N-diisobutylisonicotinamide compounds: [CoLCl2]n and [Co(L)2(H2O)4][CoLBr3]2·2H2O. Dalton Trans 2011; 40:12560-9. [DOI: 10.1039/c1dt10991j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Krzystek J, Swenson DC, Zvyagin SA, Smirnov D, Ozarowski A, Telser J. Cobalt(II) “Scorpionate” Complexes as Models for Cobalt-Substituted Zinc Enzymes: Electronic Structure Investigation by High-Frequency and -Field Electron Paramagnetic Resonance Spectroscopy. J Am Chem Soc 2010; 132:5241-53. [PMID: 20329727 DOI: 10.1021/ja910766w] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany, and Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - Dale C. Swenson
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany, and Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - S. A. Zvyagin
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany, and Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - Dmitry Smirnov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany, and Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany, and Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - Joshua Telser
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany, and Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
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Reger DL, Foley EA, Watson RP, Pellechia PJ, Smith MD, Grandjean F, Long GJ. Monofluoride bridged, binuclear metallacycles of first row transition metals supported by third generation bis(1-pyrazolyl)methane ligands: unusual magnetic properties. Inorg Chem 2010; 48:10658-69. [PMID: 19827795 DOI: 10.1021/ic901352p] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of M(BF(4))(2).xH(2)O, where M is Fe, Co, Cu, and Zn, and the ditopic, bis(pyrazolyl)methane ligand m-[CH(pz)(2)](2)C(6)H(4), L(m), where pz is a pyrazolyl ring, yields the monofluoride bridged, binuclear [M(2)(mu-F)(mu-L(m))(2)](BF(4))(3) complexes. In contrast, a similar reaction of L(m) with Ni(BF(4))(2).6H(2)O yields dibridged [Ni(2)(mu-F)(2)(mu-L(m))(2)](BF(4))(2). The solid state structures of seven [M(2)(mu-F)(mu-L(m))(2)](BF(4))(3) complexes show that the divalent metal ion is in a five-coordinate, trigonal bipyramidal, coordination environment with either a linear or nearly linear M-F-M bridging arrangement. NMR results indicate that [Zn(2)(mu-F)(mu-L(m))(2)](BF(4))(3) retains its dimeric structure in solution. The [Ni(2)(mu-F)(2)(mu-L(m))(2)](BF(4))(2) complex has a dibridging fluoride structure that has a six-coordination environment about each nickel(II) ion. In the solid state, the [Fe(2)(mu-F)(mu-L(m))(2)](BF(4))(3) and [Co(2)(mu-F)(mu-L(m))(2)](BF(4))(3) complexes show weak intramolecular antiferromagnetic exchange coupling between the two metal(II) ions with J values of -10.4 and -0.67 cm(-1), respectively; there is no observed long-range magnetic order. Three different solvates of [Cu(2)(mu-F)(mu-L(m))(2)](BF(4))(3) are diamagnetic between 5 and 400 K, thus showing strong antiferromagnetic exchange interactions of -600 cm(-1) or more negative. Mossbauer spectra indicate that [Fe(2)(mu-F)(mu-L(m))(2)](BF(4))(3) exhibits no long-range magnetic order between 4.2 and 295 K and isomer shifts that are consistent with the presence of five-coordinate, high-spin iron(II).
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Affiliation(s)
- Daniel L Reger
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, 29208, USA.
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36
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Kapoor P, Pannu APS, Hundal G, Kapoor R, Corbella M, Aliaga-Alcalde N, Hundal MS. First report on N,N′-diisoalkylisonicotinamide 1D coordination network containing linear trinuclear [Co3L4Cl6] units with mixed CoII(Td)–CoII(Oh)–CoII(Td) geometries: structure and magnetic properties. Dalton Trans 2010; 39:7951-9. [DOI: 10.1039/c0dt00245c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Pratibha Kapoor
- Department of Chemistry, Panjab University, Chandigarh, 160014, India.
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Maganas D, Milikisyants S, Rijnbeek JMA, Sottini S, Levesanos N, Kyritsis P, Groenen EJJ. A Multifrequency High-Field Electron Paramagnetic Resonance Study of CoIIS4 Coordination. Inorg Chem 2009; 49:595-605. [DOI: 10.1021/ic901911h] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dimitrios Maganas
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, GR-15771 Athens, Greece
| | - Sergey Milikisyants
- Department of Molecular Physics, Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
| | - Jorrit M. A. Rijnbeek
- Department of Molecular Physics, Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
| | - Silvia Sottini
- Department of Molecular Physics, Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
| | - Nikolaos Levesanos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, GR-15771 Athens, Greece
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, GR-15771 Athens, Greece
| | - Edgar J. J. Groenen
- Department of Molecular Physics, Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
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38
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Petsi T, Panagiotou G, Garoufalis C, Kordulisâ C, Stathi P, Deligiannakis Y, Lycourghiotis A, Bourikasâ K. Interfacial Impregnation Chemistry in the Synthesis of Cobalt Catalysts Supported on Titania. Chemistry 2009; 15:13090-104. [DOI: 10.1002/chem.200900760] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Dołęga A, Pladzyk A, Baranowska K, Jezierska J. Biomimetic zinc(II) and cobalt(II) complexes with tri-tert-butoxysilanethiolate and imidazole ligands – Structural and spectroscopic studies. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.08.028] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Imai H, Akutagawa T, Kudo F, Ito M, Toyoda K, Noro SI, Cronin L, Nakamura T. Structure, Magnetism, and Ionic Conductivity of the Gigantic {Mo176}-Wheel Assembly: Na15Fe3Co16[Mo176O528H3(H2O)80]Cl27·450H2O. J Am Chem Soc 2009; 131:13578-9. [DOI: 10.1021/ja9048042] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hiroyuki Imai
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Tomoyuki Akutagawa
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Fumito Kudo
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Mitsuhiro Ito
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Kazuhiro Toyoda
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Shin-ichiro Noro
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Leroy Cronin
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Takayoshi Nakamura
- Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo 001-0020, Japan, Graduate School of Environmental Science, Hokkaido University, Japan, Venture Business Laboratory, Nagoya Institute of Technology, Japan, WestCHEM, Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K
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41
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Xavier FR, Neves A, Casellato A, Peralta RA, Bortoluzzi AJ, Szpoganicz B, Severino PC, Terenzi H, Tomkowicz Z, Ostrovsky S, Haase W, Ozarowski A, Krzystek J, Telser J, Schenk G, Gahan LR. Unsymmetrical FeIIICoII and GaIIICoII Complexes as Chemical Hydrolases: Biomimetic Models for Purple Acid Phosphatases (PAPs). Inorg Chem 2009; 48:7905-21. [DOI: 10.1021/ic900831q] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Fernando R. Xavier
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Ademir Neves
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Annelise Casellato
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Rosely A. Peralta
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Adailton J. Bortoluzzi
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Bruno Szpoganicz
- Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Patricia C. Severino
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Hernán Terenzi
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Zbigniew Tomkowicz
- Institute of Physics, Reymonta 4, Jagiellonian University, PL-30-059 Kraków, Poland
- Institut für Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - Sergei Ostrovsky
- Institute of Applied Physics, Academy of Sciences of Moldova, Academy Str. 5, 2028 Chisinau, Moldava
- Institut für Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - Wolfgang Haase
- Institut für Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310
| | - Jerzy Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605
| | - Gerhard Schenk
- School of Molecular and Microbial Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Lawrence R. Gahan
- School of Molecular and Microbial Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia
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42
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Sundararajan M, Ganyushin D, Ye S, Neese F. Multireference ab initio studies of zero-field splitting and magnetic circular dichroism spectra of tetrahedral Co(II) complexes. Dalton Trans 2009:6021-36. [PMID: 19623403 DOI: 10.1039/b902743b] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A newly developed multireference (MR) ab initio method for the calculation of magnetic circular dichroism (MCD) spectra was calibrated through the calculation of the ground- and excited state properties of seven high-spin (S = 3/2) Co(II) complexes. The MCD spectra were computed by the explicit treatment of spin-orbit coupled (SOC) and spin-spin coupled (SSC) N-electron states. For the complexes studied in this work, we found that the SOC is more important than the SSC for determining the ground state zero field splitting (ZFS). Our computed ZFS parameter D for the [Co(PPh(3))(2)Cl(2)] model complex is -17.6 cm(-1), which is reasonably close to the experimental value of -14.8 cm(-1). Generally, the computed absorption and MCD spectra are in fair agreement with experiment for all investigated complexes. Thus, reliable electronic structure and spectroscopic predictions for medium sized transition metal complexes are feasible on the basis of this methodology. This characterizes the presented method as a promising tool for MCD spectra interpretations of transition metal complexes in a variety of areas of chemistry and biology.
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Affiliation(s)
- Mahesh Sundararajan
- Institut für Physikalische und Theoretische Chemie, Wegelerstr. 12, University of Bonn, D-53115 Bonn, Germany
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43
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Kuzu I, Krummenacher I, Hewitt I, Lan Y, Mereacre V, Powell AK, Höfer P, Harmer J, Breher F. Syntheses, Structures and Electronic Properties of Zwitterionic Iron(II) and Cobalt(II) Complexes Featuring Ambidentate Tris(pyrazolyl)methanide Ligands. Chemistry 2009; 15:4350-65. [DOI: 10.1002/chem.200802317] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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44
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Merkens H, Kappl R, Jakob RP, Schmid FX, Fetzner S. Quercetinase QueD of Streptomyces sp. FLA, a Monocupin Dioxygenase with a Preference for Nickel and Cobalt. Biochemistry 2008; 47:12185-96. [DOI: 10.1021/bi801398x] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hedda Merkens
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany, Fachrichtung 2.5 Biophysik, Universität des Saarlandes, Klinikum Geb. 76, 66421 Homburg/Saar, Germany, and Laboratorium für Biochemie, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Reinhard Kappl
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany, Fachrichtung 2.5 Biophysik, Universität des Saarlandes, Klinikum Geb. 76, 66421 Homburg/Saar, Germany, and Laboratorium für Biochemie, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Roman P. Jakob
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany, Fachrichtung 2.5 Biophysik, Universität des Saarlandes, Klinikum Geb. 76, 66421 Homburg/Saar, Germany, and Laboratorium für Biochemie, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Franz X. Schmid
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany, Fachrichtung 2.5 Biophysik, Universität des Saarlandes, Klinikum Geb. 76, 66421 Homburg/Saar, Germany, and Laboratorium für Biochemie, Universität Bayreuth, 95440 Bayreuth, Germany
| | - Susanne Fetzner
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany, Fachrichtung 2.5 Biophysik, Universität des Saarlandes, Klinikum Geb. 76, 66421 Homburg/Saar, Germany, and Laboratorium für Biochemie, Universität Bayreuth, 95440 Bayreuth, Germany
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45
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Myers WK, Duesler EN, Tierney DL. Integrated paramagnetic resonance of high-spin Co(II) in axial symmetry: chemical separation of dipolar and contact electron-nuclear couplings. Inorg Chem 2008; 47:6701-10. [PMID: 18605690 DOI: 10.1021/ic800245k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Integrated paramagnetic resonance, utilizing electron paramagnetic resonance (EPR), NMR, and electron-nuclear double resonance (ENDOR), of a series of cobalt bis-trispyrazolylborates, Co(Tp ( x )) 2, are reported. Systematic substitutions at the ring carbons and on the apical boron provide a unique opportunity to separate through-bond and through-space contributions to the NMR hyperfine shifts for the parent, unsubstituted Tp complex. A simple relationship between the chemical shift difference (delta H - delta Me) and the contact shift of the proton in that position is developed. This approach allows independent extraction of the isotropic hyperfine coupling, A iso, for each proton in the molecule. The Co..H contact coupling energies derived from the NMR, together with the known metrics of the compounds, were used to predict the ENDOR couplings at g perpendicular. Proton ENDOR data is presented that shows good agreement with the NMR-derived model. ENDOR signals from all other magnetic nuclei in the complex ( (14)N, coordinating and noncoordinating, (11)B and (13)C) are also reported.
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Affiliation(s)
- William K Myers
- Department of Chemistry and Chemical Biology, The University of New Mexico, Albuquerque, New Mexico 87131, USA
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46
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Belorizky E, Fries PH, Helm L, Kowalewski J, Kruk D, Sharp RR, Westlund PO. Comparison of different methods for calculating the paramagnetic relaxation enhancement of nuclear spins as a function of the magnetic field. J Chem Phys 2008; 128:052315. [DOI: 10.1063/1.2833957] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Slegt M, Gronheid R, van der Vlugt D, Ochiai M, Okuyama T, Zuilhof H, Overkleeft HS, Lodder G. Photochemical generation of six- and five-membered cyclic vinyl cations. J Org Chem 2007; 71:2227-35. [PMID: 16526767 DOI: 10.1021/jo0518957] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photochemical solvolyses of 4-tert-butylcyclohex-1-enyl(phenyl)iodonium tetrafluoroborate (1) and cyclopent-1-enyl(phenyl)iodonium tetrafluoroborate (2) in methanol yield vinylic ethers and vinylic cycloalkenyliodobenzenes and cycloalkenylbenzene, which are the trapping products of the geometrically destabilized C6-ring and C5-ring vinyl cation with the solvent and with the leaving group iodobenzene. Iodonium salt 2 also yields an allylic ether and allylic cyclopentenyliodobenzenes and cyclopentenylbenzene, which are the trapping products of the C5-ring allylic cation produced from the C5-ring vinyl cation by a hydride shift in a typical carbocationic rearrangement.
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Affiliation(s)
- Micha Slegt
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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Nesterov DS, Kokozay VN, Skelton BW, Jezierska J, Ozarowski A. Self-assembly of the unique heterotrimetallic Cu/Co/M complexes possessing triangular antiferromagnetic {Cu2CoPb}2and linear ferromagnetic {Cu2CoCd2} cores. Dalton Trans 2007:558-64. [PMID: 17225907 DOI: 10.1039/b612788f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel heterotrimetallic octa-[Cu2CoPbCl4(L)4]2 (1) and pentanuclear [Cu2CoCd2Cl6(L)4(HOMe)2] (2) complexes have been prepared in one-pot reactions of zerovalent copper with metal chlorides in a methanol (for 1) or acetonitrile (for 2) solution of 2-(dimethylamino)ethanol (HL) in open air. The crystal structures of both compounds consist of discrete centrosymmetric heterotrimetallic molecules revealing triangular (1) and unique consecutive (2) arrangements of magnetic CuII(2)CoII cores. The complex 1 can be viewed as a dimer made up of tetranuclear Cu2CoPbCl4(L)4 units linked through the two micro(2)-Cl atoms. The molecular structure of 2 is a pentanuclear assembly containing the previously unknown Cu(micro-O)(2)Co(micro-O)(2)Cu core. The magnetic studies of 1 revealed an antiferromagnetic coupling (J(CoCu) = 37 cm(-1) and J(CuCu) = 87 cm(-1)) while 2 exhibits a weak ferromagnetic behavior (J(CoCu) = -3.2 cm(-1) and J(CuCu) = -14.2 cm(-1)). The correlations between magnetic behaviour and structures as well as synthetic features are also discussed.
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Affiliation(s)
- Dmytro S Nesterov
- Department of Inorganic Chemistry, National Taras Shevchenko University, Volodymyrska str. 64, Kyiv 01033, Ukraine
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Krzystek J, Zvyagin SA, Ozarowski A, Trofimenko S, Telser J. Tunable-frequency high-field electron paramagnetic resonance. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2006; 178:174-83. [PMID: 16226910 DOI: 10.1016/j.jmr.2005.09.007] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2005] [Revised: 09/21/2005] [Accepted: 09/22/2005] [Indexed: 05/04/2023]
Abstract
A tunable-frequency methodology based on backward wave oscillator sources in high-frequency and -field EPR (HFEPR) is described. This methodology is illustrated by an application to three non-Kramers transition metal ion complexes and one Kramers ion complex. The complexes are of: Ni(II) (S=1) as found in dichlorobistriphenylphosphanenickel(II), Mn(III) (S=2) as found in mesotetrasulfonatoporphyrinatomanganese(III) chloride, Fe(II) (S=2) as found in ferrous sulfate tetrahydrate, and Co(II) (S=3/2) as found in azido(tris(3-tert-butylpyrazol-1-yl)hydroborate)cobalt(II). The above Ni(II) and Mn(III) complexes have been studied before by HFEPR using the multifrequency methodology based on Gunn oscillator sources, but not by the present method, while the Fe(II) and Co(II) complexes presented here have not been studied by any form of HFEPR. Highly accurate spin Hamiltonian parameters can be obtained by the experimental methodology described here, in combination with automated fitting procedures. This method is particularly successful in determining g-matrix parameters, which are very difficult to extract for high-spin systems from single frequency (or a very limited set of multi-frequency) HFEPR spectra, but is also able to deliver equally accurate values of the zero-field splitting tensor. The experimental methods involve either conventional magnetic field modulation or an optical modulation of the sub-THz wave beam. The relative merits of these and other experimental methods are discussed.
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Affiliation(s)
- J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
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