TY - JOUR
T1 - [ReF6]2-: A Robust Module for the Design of Molecule-Based Magnetic Materials
AU - Pedersen, Kasper Steen
AU - Sigrist, Marc
AU - Sørensen, Mikkel A.
AU - Barra, Anne-Laure
AU - Weyhermueller, Thomas
AU - Piligkos, Stergios
AU - Thuesen, Christian Aa
AU - Vinum, Morten G.
AU - Mutka, Hannu
AU - Weihe, Hogni
AU - Clerac, Rodolphe
AU - Bendix, Jesper
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
U2 - 10.1002/anie.201309981
DO - 10.1002/anie.201309981
M3 - Journal article
SN - 1433-7851
VL - 53
SP - 1351
EP - 1354
JO - Angewandte chemie-international edition
JF - Angewandte chemie-international edition
IS - 5
ER -