Syntheses, three types of hydrogen-bonded assembly structures, and magnetic properties of [FeIII(Him)2(hapen)]Y·solvent (Him = imidazole, hapen =N,N′-bis(2-hydroxyacetophenylidene)ethylenediamine, y = BPh4-, CF3SO3-, PF 6-, ClO4-, and BF4 -)

Masataka Koike, Keishiro Murakami, Takeshi Fujinami, Koshiro Nishi, Naohide Matsumoto, Yukinari Sunatsuki

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Five iron(III) complexes of [FeIII(Him)2(hapen)] Y·solvent with five different counter anions were synthesized, where Him = imidazole, H2hapen = N,N′-bis(2-hydroxyacetophenylidene) ethylenediamine, Y = BPh4- (1), CF3SO 3- (2), PF6- (3), ClO 4- (4), and BF4- (5), and solvent = methanol or H2O. Each FeIII ion has octahedral coordination geometry with N2O2 donor atoms of the equatorial tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. The imidazole group is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit and/or to the counter anion or solvent molecule, to give three types of assembly structures involving linear dimer, cyclic dimer, and one-dimensional zigzag chain. Compound 1, with a cyclic dimer, and 2 and 3, with a one-dimensional chain, showed spin-equilibrium behavior between high-spin (S = 5/2) and low-spin (S = 1/2) states, whereas 4 and 5, with linear dimers, are high-spin complexes. Compound 3 shows abrupt spin transition with small thermal hysteresis.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalInorganica Chimica Acta
Volume399
DOIs
Publication statusPublished - Apr 1 2013

Keywords

  • Assembly structures
  • Hydrogen bonds
  • Imidazole
  • Iron(III)
  • Spin equilibrium

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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