Abrupt spin transition with thermal hysteresis of iron(III) complex [FeIII(Him)2(hapen)]AsF6 (Him = Imidazole, H2hapen = N, N ′-Bis(2-hydroxyacetophenylidene)ethylenediamine)

Takeshi Fujinami, Masataka Koike, Naohide Matsumoto, Yukinari Sunatsuki, Atsushi Okazawa, Norimichi Kojima

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The solvent-free spin crossover iron(III) complex [FeIII(Him) 2(hapen)]AsF6 (Him = imidazole, H2hapen = N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine), exhibiting thermal hysteresis, was synthesized and characterized. The FeIII ion has an octahedral coordination geometry, with N2O2 donor atoms of the planar tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. One of two imidazoles is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit to give a hydrogen-bonded one-dimensional chain, while the other imidazole group is free from hydrogen bonding. The temperature dependencies of the magnetic susceptibilities and Mössbauer spectra revealed an abrupt spin transition between the high-spin (S = 5/2) and low-spin (S = 1/2) states, with thermal hysteresis.

Original languageEnglish
Pages (from-to)2254-2259
Number of pages6
JournalInorganic Chemistry
Volume53
Issue number4
DOIs
Publication statusPublished - Feb 17 2014

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ethylenediamine
imidazoles
Imidazoles
Hysteresis
Iron
hysteresis
iron
Atoms
Hydrogen
hydrogen
Magnetic susceptibility
Hydrogen bonds
Nitrogen
nitrogen atoms
Ions
Oxygen
Ligands
oxygen atoms
crossovers
Geometry

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Abrupt spin transition with thermal hysteresis of iron(III) complex [FeIII(Him)2(hapen)]AsF6 (Him = Imidazole, H2hapen = N, N ′-Bis(2-hydroxyacetophenylidene)ethylenediamine). / Fujinami, Takeshi; Koike, Masataka; Matsumoto, Naohide; Sunatsuki, Yukinari; Okazawa, Atsushi; Kojima, Norimichi.

In: Inorganic Chemistry, Vol. 53, No. 4, 17.02.2014, p. 2254-2259.

Research output: Contribution to journalArticle

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abstract = "The solvent-free spin crossover iron(III) complex [FeIII(Him) 2(hapen)]AsF6 (Him = imidazole, H2hapen = N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine), exhibiting thermal hysteresis, was synthesized and characterized. The FeIII ion has an octahedral coordination geometry, with N2O2 donor atoms of the planar tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. One of two imidazoles is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit to give a hydrogen-bonded one-dimensional chain, while the other imidazole group is free from hydrogen bonding. The temperature dependencies of the magnetic susceptibilities and M{\"o}ssbauer spectra revealed an abrupt spin transition between the high-spin (S = 5/2) and low-spin (S = 1/2) states, with thermal hysteresis.",
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AU - Fujinami, Takeshi

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AU - Matsumoto, Naohide

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AU - Okazawa, Atsushi

AU - Kojima, Norimichi

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N2 - The solvent-free spin crossover iron(III) complex [FeIII(Him) 2(hapen)]AsF6 (Him = imidazole, H2hapen = N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine), exhibiting thermal hysteresis, was synthesized and characterized. The FeIII ion has an octahedral coordination geometry, with N2O2 donor atoms of the planar tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. One of two imidazoles is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit to give a hydrogen-bonded one-dimensional chain, while the other imidazole group is free from hydrogen bonding. The temperature dependencies of the magnetic susceptibilities and Mössbauer spectra revealed an abrupt spin transition between the high-spin (S = 5/2) and low-spin (S = 1/2) states, with thermal hysteresis.

AB - The solvent-free spin crossover iron(III) complex [FeIII(Him) 2(hapen)]AsF6 (Him = imidazole, H2hapen = N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine), exhibiting thermal hysteresis, was synthesized and characterized. The FeIII ion has an octahedral coordination geometry, with N2O2 donor atoms of the planar tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. One of two imidazoles is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit to give a hydrogen-bonded one-dimensional chain, while the other imidazole group is free from hydrogen bonding. The temperature dependencies of the magnetic susceptibilities and Mössbauer spectra revealed an abrupt spin transition between the high-spin (S = 5/2) and low-spin (S = 1/2) states, with thermal hysteresis.

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