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

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18 Citations (Scopus)


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
Issue number4
Publication statusPublished - Feb 17 2014

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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