TY - JOUR
T1 - [ReF6]2-
T2 - a robust module for the design of molecule-based magnetic materials
AU - Pedersen, Kasper Steen
AU - Sigrist, Marc
AU - Sørensen, Mikkel Agerbæk
AU - Barra, Anne Laure
AU - Weyhermuller, Thomas
AU - Piligkos, Stergios
AU - Thuesen, Christian Aagaard
AU - Vinum, Morten G.
AU - Mutka, Hannu
AU - Weihe, Høgni
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(ReF 6)]1 (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)]1 (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(ReF 6)]1 (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)]1 (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.
KW - Coordination polymers
KW - Fluoride
KW - Magnetic anisotropy
KW - Rhenium
KW - Single-molecule magnets
U2 - 10.1002/anie.201309981
DO - 10.1002/anie.201309981
M3 - Journal article
C2 - 24459056
AN - SCOPUS:84893935994
SN - 1433-7851
VL - 53
SP - 1351
EP - 1354
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 5
ER -