Magnetic properties of V-substitution effect in an iron mixed valence complex

Norihiro Shida, Yoshiki Suzawa, Michikazu Inaba, Atsushi Okazawa, Norimichi Kojima, Masaya Enomoto*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The iron mixed-valence complex (n-C3H7)4N[FeIIFeIII(dto)3] (dto = C2O2S2) exhibits a novel type of phase transition according electron transfer between FeII and FeIII called charge transfer phase transition (CTPT). The existence of the CTPT highly depends on the 3d metal substitution with Zn, Mn, Cr, or Co for corresponding Fe site in (n-C3H7)4N[FeIIFeIII(dto)3]. Here, we prepared a series of magnetically diluted complexes (n-C3H7)4N[FeIIFeIII1−xVIIIx(dto)3] (x = 0–1), and carried out investigation of magnetic properties. Judging from the magnetic susceptibility measurement, there is no suppression of the CTPT unlike other 3d metal substituted cases. Moreover, 57Fe Mössbauer spectroscopy revealed that about 60% of FeII sites changed their spin states from high spin to low spin in case of substitution rate for x = 1.00. Since the difference of hardness and softness between metallic ions (FeII, FeIII and VIII) and coordination sites of ligand (O or S in dto), this behavior is explained by the linkage isomerization of bridging ligand in formation process of the complex.

Original languageEnglish
Pages (from-to)143-148
Number of pages6
Publication statusPublished - 2017 Nov 4
Externally publishedYes


  • Charge transfer phase transition
  • Dilution effect on 3d metal ion
  • Iron mixed valence complex
  • Linkage isomerization
  • Magnetic property

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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