[ReF6]2−: A Robust Module for the Design of Molecule‐Based Magnetic Materials |
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| Authors: | Kasper S. Pedersen Marc Sigrist Mikkel A. Sørensen Dr. Anne‐Laure Barra Dr. Thomas Weyhermüller Dr. Stergios Piligkos Dr. Christian Aa. Thuesen Morten G. Vinum Hannu Mutka Dr. Høgni Weihe Dr. Rodolphe Clérac Prof. Dr. Jesper Bendix |
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| Affiliation: | 1. Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark);2. CNRS, CRPP, UPR 8641, 33600 Pessac (France);3. Univ. Bordeaux, CRPP, UPR 8641, 33600 Pessac (France);4. Institut Laue‐Langevin, 38042 Grenoble Cedex 9 (France);5. Laboratoire National des Champs Magnétiques Intenses, CNRS, 38042 Grenoble Cedex 9 (France);6. Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr (Germany) |
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| Abstract: | A facile synthesis of the [ReF6]2? ion and its use as a building block to synthesize magnetic systems are reported. Using dc and ac magnetic susceptibility measurements, INS and EPR spectroscopies, the magnetic properties of the isolated [ReF6]2? unit in (PPh4)2[ReF6]?2 H2O ( 1 ) have been fully studied including the slow relaxation of the magnetization observed below ca. 4 K. This slow dynamic is preserved for the one‐dimensional coordination polymer [Zn(viz)4(ReF6)]∞ ( 2 , viz=1‐vinylimidazole), demonstrating the irrelevance of low symmetry for such magnetization dynamics in systems with easy‐plane‐type anisotropy. The ability of fluoride to mediate significant exchange interactions is exemplified by the isostructural [Ni(viz)4(ReF6)]∞ ( 3 ) analogue in which the ferromagnetic NiII–ReIV interaction (+10.8 cm?1) dwarfs the coupling present in related cyanide‐bridged systems. These results reveal [ReF6]2? to be an unique new module for the design of molecule‐based magnetic materials. |
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| Keywords: | coordination polymers fluoride magnetic anisotropy rhenium single‐molecule magnets |
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