Crystal structure and physical properties of (EDO-TTFBr2) 2FeX4 (X = Cl, Br)

A. Miyazaki*, M. Aimatsu, H. Yamazaki, T. Enoki, K. Ugawa, E. Ogura, Y. Kuwatani, M. Lyoda

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

The crystal structure and physical properties of radical ion salts (EDO-TTFBr2)2FeX4 (X = Cl, Br) composed of halogen-substituted organic donor and magnetic halide anions are investigated. The salts consist of uniformly stacked donor molecules, whose Br substituents are connected to halide ligands of anions with remarkably short intermolecular contacts. Both salts show metallic behavior above ca. 30K. The FeCl4 salt shows an antiferromagnetic (AF) transition at TN = 4.2K despite the absence of anion⋯anion contacts, thus the magnetic interaction between the localized spins on the anions is mediated by the π-d interaction through the Br⋯Cl contacts. For the FeBr4 salt the AF transition temperature is elevated to TN = 13.5K, accompanied with another anomaly at Tc2 = 8.5K. This behavior can be qualitatively explained by a magnetic structure model where the π-d interaction between donor and anion is taken into account.

Original languageEnglish
Pages (from-to)545-547
Number of pages3
JournalJournal De Physique. IV : JP
Volume114
DOIs
StatePublished - 2004
EventISCOM 2003: 5th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets - Port-Bourgenay, France
Duration: 2003/09/212003/09/26

Keywords

  • Molecular conductors
  • Molecular magnets
  • π-d interaction

ASJC Scopus subject areas

  • General Physics and Astronomy

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