Benzenetriimide-Based Molecular Conductor with Antiferro- to Ferromagnetic Switching Induced by Structural Change of π-stacked Array

Shohei Koyama, Yoji Horii, Tetsu Sato, Shinya Takaishi, Norihisa Hoshino, Tomoyuki Akutagawa, Hiroaki Iguchi

Research output: Contribution to journalArticlepeer-review

Abstract

Benzenetriimide (BTI) is a promising building block for materials chemistry due to its characteristic 3-fold symmetry and redox properties, whereas little is known about its conductive and magnetic properties. In this study, we synthesized three charge-transfer complexes based on N,N’,N’’-trimethylbenzenetriimide (BTI-Me). One of the complexes contains isolated dimers of BTI-Me radical anion (BTI-Me.−), while the other two have the infinite π-stacked array of BTI-Me with the formal charge of −0.5. The latter two complexes did not show metallic behavior but showed semiconducting behavior probably due to the characteristic insulation in one-dimensional electron system, so-called charge ordering and dimer-Mott insulation. The magnetic susceptibility of the complex in dimer-Mott state exhibits an unusual transition from antiferromagnetic to ferromagnetic spin states with the hysteresis loop of 15 K derived from the structural phase transition around 130 K. These properties were also supported by DFT calculations.

Original languageEnglish
JournalChemPhysChem
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • benzentriimide
  • molecular conductors
  • molecular magnetism
  • redox properties
  • π-stacking

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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