Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand

S. Iijima, F. Mizutani, O. Niwa, N. Matsumoto, Y. Sunatsuki, M. Kojima

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The spin-crossover behaviors of mixed-valence iron compounds [Fe IIH3L][FeIIIL](NO3)2 (1) and [FeIIH3LMe][FeIIIL Me](NO3)2 (2) have been investigated by 57Fe Mössbauer spectroscopy, where H3L is a hexadentate N6 tripod ligand containing three imidazole groups and H3LMe is its 2-methylimidazole derivative. Deconvolution analyses of the Mössbauer spectra revealed that a two-step SCO (LS Fe II-LS FeIII→HS FeII-LS Fe III→HS FeII-HS FeIII) proceeds in each compound on elevating the temperature. Compound 2 exhibited lower spin-transition temperatures than 1. "Frozen-in effect" was observed below 120 and 50 K for 1 and 2, respectively.

Original languageEnglish
Pages (from-to)397-402
Number of pages6
JournalHyperfine Interactions
Volume166
Issue number1-4
DOIs
Publication statusPublished - Nov 1 2005

Keywords

  • Hydrogen bonds
  • Iron complex
  • Mixed-valence
  • Mössbauer spectroscopy
  • Spin-crossover
  • Tripod ligand
  • Two-dimensional structure

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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