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

doi:10.1007/s10751-006-9299-0

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

Advanced Science Research Center

Research output: Contribution to journal › Article

4 Citations (Scopus)

Abstract

The spin-crossover behaviors of mixed-valence iron compounds [Fe ^IIH₃L][Fe^IIIL](NO₃)₂ (1) and [Fe^IIH₃L^Me][Fe^IIIL ^Me](NO₃)₂ (2) have been investigated by ⁵⁷Fe Mössbauer spectroscopy, where H₃L is a hexadentate N₆ tripod ligand containing three imidazole groups and H₃L^Me is its 2-methylimidazole derivative. Deconvolution analyses of the Mössbauer spectra revealed that a two-step SCO (LS Fe ^II-LS Fe^III→HS Fe^II-LS Fe ^III→HS Fe^II-HS Fe^III) 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 language	English
Pages (from-to)	397-402
Number of pages	6
Journal	Hyperfine Interactions
Volume	166
Issue number	1-4
DOIs	https://doi.org/10.1007/s10751-006-9299-0
Publication status	Published - Nov 1 2005

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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

Cite this

Iijima, S., Mizutani, F., Niwa, O., Matsumoto, N., Sunatsuki, Y., & Kojima, M. (2005). Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand. Hyperfine Interactions, 166(1-4), 397-402. https://doi.org/10.1007/s10751-006-9299-0

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title = "M{\"o}ssbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand",

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.",

keywords = "Hydrogen bonds, Iron complex, Mixed-valence, M{\"o}ssbauer spectroscopy, Spin-crossover, Tripod ligand, Two-dimensional structure",

author = "S. Iijima and F. Mizutani and O. Niwa and N. Matsumoto and Y. Sunatsuki and M. Kojima",

year = "2005",

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doi = "10.1007/s10751-006-9299-0",

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T1 - Mössbauer studies of mixed-valence spin-crossover iron complexes with a hexadentate tripod ligand

AU - Iijima, S.

AU - Mizutani, F.

AU - Niwa, O.

AU - Matsumoto, N.

AU - Sunatsuki, Y.

AU - Kojima, M.

PY - 2005/11/1

Y1 - 2005/11/1

N2 - 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.

AB - 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.

KW - Hydrogen bonds

KW - Iron complex

KW - Mixed-valence

KW - Mössbauer spectroscopy

KW - Spin-crossover

KW - Tripod ligand

KW - Two-dimensional structure

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DO - 10.1007/s10751-006-9299-0

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JO - Hyperfine Interaction

JF - Hyperfine Interaction

SN - 0304-3843

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10.1007/s10751-006-9299-0