High spin/low spin phase transitions of a spin-crossover complex in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using PVA as a protective colloid

Atsushi Suzuki, Motoyasu Fujiwara, Masahiko Nishijima

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have studied the magnetic properties of an Fe(II) spin-crossover complex near its high spin/low spin (HS/LS) phase transition in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using poly(vinyl alcohol) (PVA) as a protective colloid, in comparison with sodium lauryl sulfate (SLS). Morphological analysis was used to establish that the nanodispersed spin-crossover complex was incorporated into the cores of polymer particles covered with PVA shells. The obvious bi-stability of the HS/LS phase transition was considered by the identification of multiplet states such as the triplet (S = 1) and quintet (S = 2) states, and the paramagnetic state (S = 1/2), by noting a gradual shift of g-value anisotropy in the electron spin resonance (ESR) spectrum at 5 K. This was thought to have arisen from the exchange interaction as a Jahn-Teller effect in the emulsion particles. Chemical modifications such as ligand substitution, and the nature of the central metal atom in the emulsion particle, especially influenced the HS/LS phase transition.

Original languageEnglish
Pages (from-to)525-534
Number of pages10
JournalColloid and Polymer Science
Volume286
Issue number5
DOIs
Publication statusPublished - 2008 May 1

Keywords

  • Emulsion polymerization
  • Highspin/low spin (HS/LS) phase transition
  • Poly(vinylalcohol) (PVA)
  • Spin-crossover complex
  • Trifluoroethyl methacrylate(TFEMA)

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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