Syntheses, hydrogen-bonded assembly structures, and spin crossover properties of [FeIII(Him)2(n-MeOhapen)]PF6 (Him = imidazole and n-MeOhapen = N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine); n = 4, 5, 6)

Takeshi Fujinami, Mizuki Ikeda, Masataka Koike, Naohide Matsumoto, Tomohiro Oishi, Yukinari Sunatsuki

Research output: Contribution to journalArticle

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Three iron(III) complexes, [FeIII(Him)2(n-MeOhapen)]PF6 (1: n = 4, 2: n = 5, 3: n = 6), where Him = imidazole and n-MeOhapen = N,N′-bis(n-methoxy-2-oxyacetophenylidene)ethylenediamine, were synthesized. Each FeIII ion was coordinated by N4O2 donor atoms of equatorial n-MeOhapen and two axial Him. The saturated FeC2N2 chelate ring involving the ethylenediamine moiety adopted a gauche conformation and the two phenylidene planes of [FeIII(Him)2(n-MeOhapen)]+ were oriented opposite to the FeO2N2 coordination plane. Two adjacent [FeIII(Him)2(4-MeOhapen)]+ cations in 1 were connected via PF6- ions by hydrogen bonds between the imidazole group and PF6- to give a one-dimensional chain. Two adjacent cations in 2 were connected via hydrogen bonds between the phenylidene oxygen and imidazole atoms to form a cyclic dimer structure. Two EtOH molecules were involved in a hydrogen-bonded cyclic dimer structure in 3. Compounds 1 and 2 showed spin crossover behavior, but 3 showed incomplete spin crossover.

Original languageEnglish
Pages (from-to)89-95
Number of pages7
JournalInorganica Chimica Acta
Publication statusPublished - Jun 1 2015



  • Assembly structures
  • Hydrogen bonds
  • Imidazole
  • Iron(III) complex
  • N<inf>2</inf>O<inf>2</inf> Schiff-base ligand
  • Spin equilibrium

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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