Synthesis, structure, and spin equilibrium properties of [FeIIIX2L]BPh4 solvents (X = 1-methylimidazole and imidazole; L = N, N′-bis(3-ethoxycarbonylsalicylidene)ethylenediamine)

Takeshi Fujinami, Daisuke Hamada, Naohide Matsumoto, Yukinari Sunatsuki, Ryo Irie

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Two iron(III) complexes [FeIIIX2L]BPh4 solvents (X = 1-Meim (1), Him (2)) were synthesized and the crystal structures were determined, where H2L = N, N'-bis(3-ethoxycarbonylsalicylidene)ethylenediamine, 1-Meim = 1-methylimidazole, Him = imidazole, BPh4- = tetraphenylborate. FeIII ion has an octahedral coordination environment by N2O2 donor atoms of equatorial L2- and N2 donor atoms of axial imidazoles. Complex 1 is described as isolated molecule, while complex 2 has a hydrogen-bonded cyclic dimer structure constructed by hydrogen-bond between imidazole group and ethoxycarbonyl oxygen via ethanol. Complex 1 is in a high-spin (S = 5/2) state over the whole temperature region 5-300 K, while complex 2 showed a gradual complete spin equilibrium between high and low-spin states at T1/2 = 192 K.

Original languageEnglish
Pages (from-to)239-244
Number of pages6
JournalInorganica Chimica Acta
Publication statusPublished - May 1 2015



  • 1-Methyimidazole
  • Imidazole
  • Iron(III)
  • NO Schiff-base ligand
  • Spin crossover

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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