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

S. Iijima, F. Mizutani, O. Niwa, N. Matsumoto, Yukinari 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 2005

Fingerprint

Iron Compounds
Iron compounds
iron compounds
tripods
spin temperature
Deconvolution
imidazoles
Superconducting transition temperature
crossovers
Iron
transition temperature
Ligands
Spectroscopy
Derivatives
valence
iron
ligands
spectroscopy
Temperature
temperature

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Nuclear and High Energy Physics

Cite this

Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand. / Iijima, S.; Mizutani, F.; Niwa, O.; Matsumoto, N.; Sunatsuki, Yukinari; Kojima, M.

In: Hyperfine Interactions, Vol. 166, No. 1-4, 11.2005, p. 397-402.

Research output: Contribution to journalArticle

Iijima, S. ; Mizutani, F. ; Niwa, O. ; Matsumoto, N. ; Sunatsuki, Yukinari ; Kojima, M. / Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand. In: Hyperfine Interactions. 2005 ; Vol. 166, No. 1-4. pp. 397-402.
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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 M{\"o}ssbauer spectroscopy, where H3L is a hexadentate N6 tripod ligand containing three imidazole groups and H3LMe is its 2-methylimidazole derivative. Deconvolution analyses of the M{\"o}ssbauer 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.",
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AU - Iijima, S.

AU - Mizutani, F.

AU - Niwa, O.

AU - Matsumoto, N.

AU - Sunatsuki, Yukinari

AU - Kojima, M.

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