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Le Guennic B, Petit S, Chastanet G, Pilet G, Dominique Luneau,*, Amor NB, Robert V. Antiferromagnetic Behavior Based on Quasi-Orthogonal MOs: Synthesis and Characterization of a Cu3 Oxidase Model. Inorg Chem 2007; 47:572-7. [DOI: 10.1021/ic701758x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Boris Le Guennic
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
| | - Sarah Petit
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
| | - Guillaume Chastanet
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
| | - Guillaume Pilet
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
| | - Dominique Luneau,*
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
| | - Nadia Ben Amor
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
| | - Vincent Robert
- Université de Lyon, Laboratoire de Chimie, CNRS, Ecole normale supérieure de Lyon, 46 allée d'Italie, 69364 Lyon cedex07, France, Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615), 69622 Villeurbanne cedex, France, and Laboratoire de Physique Quantique (UMR 5626), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
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Yoon J, Mirica LM, Stack TDP, Solomon EI. Spectroscopic Demonstration of a Large Antisymmetric Exchange Contribution to the Spin-Frustrated Ground State of a D3 Symmetric Hydroxy-Bridged Trinuclear Cu(II) Complex: Ground-to-Excited State Superexchange Pathways. J Am Chem Soc 2004; 126:12586-95. [PMID: 15453791 DOI: 10.1021/ja046380w] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The magnetic and electronic properties of a spin-frustrated ground state of an antiferromagnetically coupled 3-fold symmetric trinuclear copper complex (TrisOH) is investigated using a combination of variable-temperature variable-field magnetic circular dichroism (VTVH MCD) and powder/single-crystal EPR. Direct evidence for a low-lying excited S = (1)/(2) state from the zero-field split ground (2)E state is provided by the nonlinear dependence of the MCD intensity on 1/T and the nesting of the VTVH MCD isotherms. A consistent zero-field splitting (Delta) value of approximately 65 cm(-1) is obtained from both approaches. In addition, the strong angular dependence of the single-crystal EPR spectrum, with effective g-values from 2.32 down to an unprecedented 1.2, requires in-state spin-orbit coupling of the (2)E state via antisymmetric exchange. The observable EPR intensities also require lowering of the symmetry of the trimer structure, likely reflecting a magnetic Jahn-Teller effect. Thus, the Delta of the ground (2)E state is shown to be governed by the competing effects of antisymmetric exchange (G = 36.0 +/- 0.8 cm(-1)) and symmetry lowering (delta = 17.5 +/- 5.0 cm(-1)). G and delta have opposite effects on the spin distribution over the three metal sites where the former tends to delocalize and the latter tends to localize the spin of the S(tot) = (1)/(2) ground state on one metal center. The combined effects lead to partial delocalization, reflected by the observed EPR parallel hyperfine splitting of 74 x 10(-4) cm(-1). The origin of the large G value derives from the efficient superexchange pathway available between the ground d(x2-y2) and excited d(xy) orbitals of adjacent Cu sites, via strong sigma-type bonds with the in-plane p-orbitals of the bridging hydroxy ligands. This study provides significant insight into the orbital origin of the spin Hamiltonian parameters of a spin-frustrated ground state of a trigonal copper cluster.
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Affiliation(s)
- Jungjoo Yoon
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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Mahapatra S, Halfen JA, Wilkinson EC, Pan G, Wang X, Young VG, Cramer CJ, Que, L, Tolman WB. Structural, Spectroscopic, and Theoretical Characterization of Bis(μ-oxo)dicopper Complexes, Novel Intermediates in Copper-Mediated Dioxygen Activation. J Am Chem Soc 1996. [DOI: 10.1021/ja962305c] [Citation(s) in RCA: 201] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Samiran Mahapatra
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Jason A. Halfen
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Elizabeth C. Wilkinson
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Gaofeng Pan
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Xuedong Wang
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Victor G. Young
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Christopher J. Cramer
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - Lawrence Que,
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
| | - William B. Tolman
- Contribution from the Department of Chemistry, Center for Metals in Biocatalysis, and Supercomputer Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455
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