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The First 1,3,4‐Oxadiazole Based Dinuclear Iron(II) Complexes Showing Spin Crossover Behavior with Hysteresis
Author(s) -
Köhler Christian,
Rentschler Eva
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501278
Subject(s) - spin crossover , chemistry , thermal hysteresis , spin transition , spin states , crystallography , oxadiazole , ligand (biochemistry) , mössbauer spectroscopy , counterion , hysteresis , spin (aerodynamics) , inorganic chemistry , ion , condensed matter physics , phase transition , organic chemistry , biochemistry , physics , receptor , aerospace engineering , engineering
Three new dinuclear complexes [Fe II 2 (μ‐ L ) 2 ]X 4 ( L is the bis‐tridentate ligand 2,5‐bis{[(2‐pyridylmethyl)amino]methyl}‐1,3,4‐oxadiazole and X = ClO 4 – , BF 4 – and CF 3 SO 3 – ) have been synthesized and fully characterized by single‐crystal X‐ray diffraction, Mössbauer spectroscopy and magnetic susceptibility measurements. Upon cooling, a trapped [high‐spin–low‐spin] state of the iron(II) centres is detected. Depending on the counterion, a pronounced thermal hysteresis is found. In one case, it was possible to observe a space group change that accompanies the spin transition. This is the first system showing spin crossover based on an oxadiazole ligand.