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Article Dans Une Revue Angewandte Chemie International Edition Année : 2020

Access to Heteroleptic Fluorido‐Cyanido Complexes with a Large Magnetic Anisotropy by Fluoride Abstraction

Résumé

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-[M IV F 4 (CN) 2 ] 2À (M = Re, Os), obtained from their homoleptic [M IV F 6 ] 2À 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-[ReF 4 (CN) 2 ] 2À as compared to [ReF 6 ] 2À , reflecting the severe departure from an ideal octahedral (O h 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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Matériaux
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Dates et versions

hal-02894589 , version 1 (09-07-2020)

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Jun-Liang Liu, Kasper S Pedersen, Samuel M Greer, Itziar A Oyarzabal, Abhishake Mondal, et al.. Access to Heteroleptic Fluorido‐Cyanido Complexes with a Large Magnetic Anisotropy by Fluoride Abstraction. Angewandte Chemie International Edition, 2020, 59 (26), pp.10306-10310. ⟨10.1002/anie.201914934⟩. ⟨hal-02894589⟩
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