Cation size effect on photomagnetism and charge transfer phase transition of iron mixed-valence complexes with spiropyrans

Junya Yoshida, Noriyuki Kida, Atsushi Okazawa, Norimichi Kojima*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We have investigated the magnetic properties of a photoresponsive organic-inorganic hybrid system, (SP-R)[FeIIFeIII(dto) 3] (SP = spiropyran; R = Me, Et, Pr; dto = C2O 2S2), under hydrostatic pressures. At ambient pressure, (SP-Et)[FeIIFeIII(dto)3] and (SP-Pr)[Fe IIFeIII(dto)3] undergo one and two ferromagnetic phase transitions corresponding to the high-temperature phase with the spin configuration of FeII(S = 2)-FeIII(S = 1/2), while (SP-Me)[FeIIFeIII(dto)3] undergoes two ferromagnetic phase transitions corresponding to the coexistence of the high-temperature phase and the low-temperature phase with the spin configuration of FeII(S = 0)-FeIII(S = 5/2). Under hydrostatic pressures, (SP-R)[FeIIFeIII(dto)3] (R = Et, Pr) undergo a new ferromagnetic phase transition corresponding to the low-temperature phase caused by the pressure-induced charge transfer phase transition.

Original languageEnglish
Pages (from-to)102-107
Number of pages6
JournalPolyhedron
Volume66
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Charge transfer phase transition
  • Dithiooxalate
  • High pressure
  • Iron mixed-valence complexes
  • Photoisomerization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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