Spin crossover in a supramolecular FeII-FeIII system

Hiromi Ohta; Yukinari Sunatsuki; Yuichi Ikuta; Naohide Matsumoto; Seiichiro Iijima; Haruo Akashi; Takashi Kambe; Masaaki Kojevia

Spin crossover in a supramolecular Fe^II-Fe^III system

Hiromi Ohta, Yukinari Sunatsuki, Yuichi Ikuta, Naohide Matsumoto, Seiichiro Iijima, Haruo Akashi, Takashi Kambe, Masaaki Kojevia

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The structure of [Fe^II(H₃L)](ClO₄)₂·3H ₂O, where H₃L is a tripodal hexadentate ligand derived from the 1:3 condensation of tris(2-aminoethyl)amine and 4-formylimidazole, has been determined by X-ray crystallography at 113 and 293 K. A spin transition was inferred from the Fe-N bond distances. The temperature dependence of the magnetic susceptibility revealed that the complex undergoes a gradual spin transition in the temperature range of 150-270 K. A mixed-valence complex, [Fe^II(H₃L)][Fe^III(L)]- (BF₄)₂-1.5H₂O, was prepared by the controlled deprotonation of the protonated species, [Fe^II(H₃L)](BF₄)₂-1.5H₂O, under aerobic conditions, and the X-ray structure was determined at 293 K. Two species, [Fe^II(H₃L)]₂₊ and [Fe^III(L)], are linked by imidazole-imidazolate (NH-N) hydrogen bonds to form a puckered sheet structure. Magnetic susceptibility measurements and Mössbauer spectra provided an evidence for spin-crossover at both the Fe^II and Fe^III sites. There are three accessible electronic states: (LS Fe^II-LS Fe^III), (HS Fe^II-LS Fe^III), and (HS Fe^II-HS Fe^III) that occur in passing from lower to higher temperatures.

Original language	English
Pages (from-to)	191-198
Number of pages	8
Journal	Materials Science- Poland
Volume	21
Issue number	2
Publication status	Published - Dec 1 2003

Keywords

Hydrogen bonds
Spin crossover
Tripodal ligand

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "Spin crossover in a supramolecular FeII-FeIII system",

abstract = "The structure of [FeII(H3L)](ClO4)2·3H 2O, where H3L is a tripodal hexadentate ligand derived from the 1:3 condensation of tris(2-aminoethyl)amine and 4-formylimidazole, has been determined by X-ray crystallography at 113 and 293 K. A spin transition was inferred from the Fe-N bond distances. The temperature dependence of the magnetic susceptibility revealed that the complex undergoes a gradual spin transition in the temperature range of 150-270 K. A mixed-valence complex, [FeII(H3L)][FeIII(L)]- (BF4)2-1.5H2O, was prepared by the controlled deprotonation of the protonated species, [FeII(H3L)](BF4)2-1.5H2O, under aerobic conditions, and the X-ray structure was determined at 293 K. Two species, [FeII(H3L)]2+ and [FeIII(L)], are linked by imidazole-imidazolate (NH-N) hydrogen bonds to form a puckered sheet structure. Magnetic susceptibility measurements and M{\"o}ssbauer spectra provided an evidence for spin-crossover at both the FeII and FeIII sites. There are three accessible electronic states: (LS FeII-LS FeIII), (HS FeII-LS FeIII), and (HS FeII-HS FeIII) that occur in passing from lower to higher temperatures.",

keywords = "Hydrogen bonds, Spin crossover, Tripodal ligand",

author = "Hiromi Ohta and Yukinari Sunatsuki and Yuichi Ikuta and Naohide Matsumoto and Seiichiro Iijima and Haruo Akashi and Takashi Kambe and Masaaki Kojevia",

year = "2003",

month = dec,

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language = "English",

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pages = "191--198",

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TY - JOUR

T1 - Spin crossover in a supramolecular FeII-FeIII system

AU - Ohta, Hiromi

AU - Sunatsuki, Yukinari

AU - Ikuta, Yuichi

AU - Matsumoto, Naohide

AU - Iijima, Seiichiro

AU - Akashi, Haruo

AU - Kambe, Takashi

AU - Kojevia, Masaaki

PY - 2003/12/1

Y1 - 2003/12/1

N2 - The structure of [FeII(H3L)](ClO4)2·3H 2O, where H3L is a tripodal hexadentate ligand derived from the 1:3 condensation of tris(2-aminoethyl)amine and 4-formylimidazole, has been determined by X-ray crystallography at 113 and 293 K. A spin transition was inferred from the Fe-N bond distances. The temperature dependence of the magnetic susceptibility revealed that the complex undergoes a gradual spin transition in the temperature range of 150-270 K. A mixed-valence complex, [FeII(H3L)][FeIII(L)]- (BF4)2-1.5H2O, was prepared by the controlled deprotonation of the protonated species, [FeII(H3L)](BF4)2-1.5H2O, under aerobic conditions, and the X-ray structure was determined at 293 K. Two species, [FeII(H3L)]2+ and [FeIII(L)], are linked by imidazole-imidazolate (NH-N) hydrogen bonds to form a puckered sheet structure. Magnetic susceptibility measurements and Mössbauer spectra provided an evidence for spin-crossover at both the FeII and FeIII sites. There are three accessible electronic states: (LS FeII-LS FeIII), (HS FeII-LS FeIII), and (HS FeII-HS FeIII) that occur in passing from lower to higher temperatures.

AB - The structure of [FeII(H3L)](ClO4)2·3H 2O, where H3L is a tripodal hexadentate ligand derived from the 1:3 condensation of tris(2-aminoethyl)amine and 4-formylimidazole, has been determined by X-ray crystallography at 113 and 293 K. A spin transition was inferred from the Fe-N bond distances. The temperature dependence of the magnetic susceptibility revealed that the complex undergoes a gradual spin transition in the temperature range of 150-270 K. A mixed-valence complex, [FeII(H3L)][FeIII(L)]- (BF4)2-1.5H2O, was prepared by the controlled deprotonation of the protonated species, [FeII(H3L)](BF4)2-1.5H2O, under aerobic conditions, and the X-ray structure was determined at 293 K. Two species, [FeII(H3L)]2+ and [FeIII(L)], are linked by imidazole-imidazolate (NH-N) hydrogen bonds to form a puckered sheet structure. Magnetic susceptibility measurements and Mössbauer spectra provided an evidence for spin-crossover at both the FeII and FeIII sites. There are three accessible electronic states: (LS FeII-LS FeIII), (HS FeII-LS FeIII), and (HS FeII-HS FeIII) that occur in passing from lower to higher temperatures.

KW - Hydrogen bonds

KW - Spin crossover

KW - Tripodal ligand

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Spin crossover in a supramolecular Fe^II-Fe^III system

Abstract

Keywords

ASJC Scopus subject areas

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