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 › peer-review

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

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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@article{283c61024b0e41788fef50f1929633ea,

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",

month = nov,

day = "1",

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

language = "English",

volume = "166",

pages = "397--402",

journal = "Hyperfine Interaction",

issn = "0304-3843",

publisher = "Springer Netherlands",

number = "1-4",

}

TY - JOUR

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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U2 - 10.1007/s10751-006-9299-0

DO - 10.1007/s10751-006-9299-0

M3 - Article

AN - SCOPUS:33845723616

VL - 166

SP - 397

EP - 402

JO - Hyperfine Interaction

JF - Hyperfine Interaction

SN - 0304-3843

IS - 1-4

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