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Simultaneous Spin‐Crossover Transition and Conductivity Switching in a Dinuclear Iron(II) Coordination Compound Based on 7,7′,8,8′‐Tetracyano‐ p ‐quinodimethane
Author(s) -
Ishikawa Ryuta,
Ueno Shuya,
Nifuku Shoei,
Horii Yoji,
Iguchi Hiroaki,
Miyazaki Yuji,
Nakano Motohiro,
Hayami Shinya,
Kumagai Shohei,
Katoh Keiichi,
Li ZhaoYang,
Yamashita Masahiro,
Kawata Satoshi
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903934
Subject(s) - spin crossover , conductivity , transition metal , coordination complex , crossover , condensed matter physics , chemistry , spin (aerodynamics) , materials science , crystallography , metal , physics , thermodynamics , metallurgy , computer science , organic chemistry , artificial intelligence , catalysis
The reaction of Fe(OAc) 2 and Hbpypz with neutral TCNQ results in the formation of [Fe 2 (bpypz) 2 (TCNQ) 2 ](TCNQ) 2 ( 1 ), in which Hbpypz=3,5‐bis(2‐pyridyl)pyrazole and TCNQ=7,7′,8,8′‐tetracyano‐ p ‐quinodimethane. Crystal packing of 1 with uncoordinated TCNQ and π–π stacking of bpypz − ligands produces an extended two‐dimensional supramolecular coordination assembly. Temperature dependence of the dc magnetic susceptibility and heat capacity measurements indicate that 1 undergoes an abrupt spin crossover (SCO) with thermal spin transition temperatures of 339 and 337 K for the heating and cooling modes, respectively, resulting in a thermal hysteresis of 2 K. Remarkably, the temperature dependence of dc electrical transport exhibits a transition that coincides with thermal SCO, demonstrating the thermally induced magnetic and electrical bistability of 1 , strongly correlating magnetism with electrical conductivity. This outstanding feature leads to thermally induced simultaneous switching of magnetism and electrical conductivity and a magnetoresistance effect.