Simultaneous Spin-Crossover Transition and Conductivity Switching in a Dinuclear Iron(II) Coordination Compound Based on 7,7′,8,8′-Tetracyano-p-quinodimethane

Ryuta Ishikawa, Shuya Ueno, Shoei Nifuku, Yoji Horii, Hiroaki Iguchi, Yuji Miyazaki, Motohiro Nakano, Shinya Hayami, Shohei Kumagai, Keiichi Katoh, Zhao Yang Li, Masahiro Yamashita, Satoshi Kawata

研究成果: Article査読

3 被引用数 (Scopus)

抄録

The reaction of Fe(OAc)2 and Hbpypz with neutral TCNQ results in the formation of [Fe2(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.

本文言語English
ページ(範囲)1278-1285
ページ数8
ジャーナルChemistry - A European Journal
26
6
DOI
出版ステータスPublished - 2020 1 27

ASJC Scopus subject areas

  • 触媒
  • 有機化学

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