Crystal structures, and electrical conducting and magnetic properties in the plate crystals of (ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide)2 · MX4 (M=Fe, Ga, X=Br; M=Fe, X=C1) salts

Takuya Matsumoto, Tsuyoshi Kominami, Kazumasa Ueda, Toyonari Sugimoto, Toshiji Tada, Harukazu Yoshino, Keizo Murata, Motoo Shiro, Ei Ichi Negishi, Hiroshi Matsui, Naoki Toyota, Satoshi Endo, Kazuko Takahashi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

By the reaction of a new donor molecule, ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide (1) with FeBr3, GaBr3 or FeCl3 in CH3CN/CS2 charge transfer (CT) salts of 1 with counteranions of FeBr4-, GaBr4- or FeCl4- (12 · FeBr4, 12 · GaBr4 and 12 · FeCl4) as plate crystals were obtained. Their crystal structures are apparently similar to each other, in which 1 molecules are dimerized in the parallel direction of their molecular long axes, and the dimers are stacked with changing the direction of the molecular long axes alternately to form a one- dimensional column. The counteranions intervene between the 1-stacked columns and are aligned in a zigzag manner. The room-temperature electrical conductivities of 12 · FeBr4 and 12 · GaBr4 are fairly high (10-15 S cm-1), but a small value (0.8 S cm-1) is obtained for 12 · FeCl4. For all CT salts, temperature dependences of electrical conductivity are semiconducting in spite of very small activation energies (30-90 me V). Based on the comparison between their electrical conducting and magnetic properties, it is suggested that the d spins of FeBr4- or FeCl4- ions exert almost no influence on the π conducting electrons in the 1-stacked column.

Original languageEnglish
Pages (from-to)408-417
Number of pages10
JournalJournal of Solid State Chemistry
Volume168
Issue number2
DOIs
Publication statusPublished - 2002 Nov 1

Keywords

  • Charge-transfer salt
  • High electrical conductivity
  • Magnetic anion
  • New donor molecule
  • Semiconducting
  • Very small π-d interaction

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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