Access to Heteroleptic Fluorido-Cyanido Complexes with a Large Magnetic Anisotropy by Fluoride Abstraction |
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| Authors: | Dr Jun-Liang Liu Prof?Dr Kasper S Pedersen Dr Samuel M Greer Dr Itziar Oyarzabal Dr Abhishake Mondal Prof?Dr Stephen Hill Dr Fabrice Wilhelm Dr Andrei Rogalev Dr Alain Tressaud Etienne Durand Prof?Dr Jeffrey R Long Dr Rodolphe Clérac |
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| Institution: | 1. Univ. Bordeaux, CNRS, Centre de Recherche Paul Pascal, CRPP, UMR 5031, 33600 Pessac, France;2. Department of Chemistry, Florida State University;3. Department of Physics, Florida State University;4. ESRF-The European Synchrotron, 38043 Grenoble Cedex 9, France;5. CNRS, ICMCB, UPR 9048, Univ. Bordeaux, 33608 Pessac, France;6. Department of Chemistry, University of California Berkeley, USA |
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| Abstract: | Silicon-mediated fluoride abstraction is demonstrated as a means of generating the first fluorido-cyanido transition metal complexes. This new synthetic approach is exemplified by the synthesis and characterization of the heteroleptic complexes, trans-MIVF4(CN)2]2? (M=Re, Os), obtained from their homoleptic MIVF6]2? parents. As shown by combined high-field electron paramagnetic resonance spectroscopy and magnetization measurements, the partial substitution of fluoride by cyanide ligands leads to a marked increase in the magnetic anisotropy of trans-ReF4(CN)2]2? as compared to ReF6]2?, reflecting the severe departure from an ideal octahedral (Oh point group) ligand field. This methodology paves the way toward the realization of new heteroleptic transition metal complexes that may be used as highly anisotropic building-blocks for the design of high-performance molecule-based magnetic materials. |
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| Keywords: | Cyanide EPR-Spektroskopie Fluoride Magnetische Anisotropie Einzelmolekül-Magnete |
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