[ReF6]2-: A Robust Module for the Design of Molecule-Based Magnetic Materials

Kasper Steen Pedersen, Marc Sigrist, Mikkel A. Sørensen, Anne-Laure Barra, Thomas Weyhermueller, Stergios Piligkos, Christian Aa Thuesen, Morten G. Vinum, Hannu Mutka, Hogni Weihe, Rodolphe Clerac, Jesper Bendix

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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]·2H2O (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 iso-structural [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.
Original languageEnglish
JournalAngewandte chemie-international edition
Issue number5
Pages (from-to)1351-1354
Publication statusPublished - 2014
Externally publishedYes

Cite this

Pedersen, K. S., Sigrist, M., Sørensen, M. A., Barra, A-L., Weyhermueller, T., Piligkos, S., Thuesen, C. A., Vinum, M. G., Mutka, H., Weihe, H., Clerac, R., & Bendix, J. (2014). [ReF6]2-: A Robust Module for the Design of Molecule-Based Magnetic Materials. Angewandte chemie-international edition, 53(5), 1351-1354. https://doi.org/10.1002/anie.201309981