Anomalous spin crossover of mechanically strained iron(II) complexes, with 1,10-phenanthroline with their counterions, NCS- and PF6/-

Naoko Tsuchiya, Atsushi Tsukamoto, Tadashi Ohshita, Tetsuhiko Isobe, Mamoru Senna, Naoki Yoshioka, Hidenari Inoue

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Effects of counterions on the change in the magnetic behavior due to mechanical amorphization have been examined on iron(II) complexes with 1,10-phenanthroline, Fe(phen)2(NCS)2, [Fe(phen)3](NCS)2·H2O, and [Fe(phen)3](PF6)2, at temperatures between 2 K and 300 K. Amorphization results in the increase in χ(M)T, where χ(M) is molar magnetic susceptibility and T is temperature, in two modes, i.e., a jump at temperatures below 20 K and a subsequent gradual increase. The first mode is attributed to the mechanically induced high spin state (5T(2g)) which is made metastable below 20 K. The second is the thermally induced transition from a low spin (1A(1g)) to a high spin (5T(2g)) state for the distorted complexes with the widened distribution of the ligand field strength. The stabilization of the HS state is mainly due to the ligand field distortion caused by mechanical amorphization. Coordination of ionic species, NCS- and PF6/-, originally serving as counterions, plays a significant role in the ligand field distortion. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)82-91
Number of pages10
JournalJournal of Solid State Chemistry
Volume153
Issue number1
DOIs
Publication statusPublished - 2000 Jan 1

Keywords

  • Counterion
  • Iron(II) complex crystals
  • Ligand field strength
  • Mechanical stressing
  • Spin crossover

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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