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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1278-1285
Number of pages8
JournalChemistry - A European Journal
Volume26
Issue number6
DOIs
Publication statusPublished - 2020 Jan 27

Keywords

  • TCNQ
  • conducting materials
  • iron
  • semiconductors
  • spin crossover

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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