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[ReF 6 ] 2− : A Robust Module for the Design of Molecule‐Based Magnetic Materials
Author(s) -
Pedersen Kasper S.,
Sigrist Marc,
Sørensen Mikkel A.,
Barra AnneLaure,
Weyhermüller Thomas,
Piligkos Stergios,
Thuesen Christian Aa.,
Vinum Morten G.,
Mutka Hannu,
Weihe Høgni,
Clérac Rodolphe,
Bendix Jesper
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201309981
Subject(s) - isostructural , magnetization , chemistry , magnetic anisotropy , electron paramagnetic resonance , molecule , relaxation (psychology) , crystallography , magnetic susceptibility , ion , ferromagnetism , fluoride , nuclear magnetic resonance , condensed matter physics , physics , magnetic field , inorganic chemistry , crystal structure , organic chemistry , psychology , social psychology , quantum mechanics
A facile synthesis of the [ReF 6 ] 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 [ReF 6 ] 2− unit in (PPh 4 ) 2 [ReF 6 ]⋅2 H 2 O ( 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 (ReF 6 )] ∞ ( 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 (ReF 6 )] ∞ ( 3 ) analogue in which the ferromagnetic Ni II –Re IV interaction (+10.8 cm −1 ) dwarfs the coupling present in related cyanide‐bridged systems. These results reveal [ReF 6 ] 2− to be an unique new module for the design of molecule‐based magnetic materials.