Metallic conductivity and ferromagnetic interaction of iron(III) d spins in the needle crystals of (ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide)2 ·FeBr4 salt

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

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

The 2:1 charge-transfer (CT) salts (12·FeBr4 and 12·GaBr4) of ethylenedithiotetrathiafulvalenoquinone-1,3dithiolemethide (1) with FeBr4- and GaBr4- counteranions were obtained as needle crystals, whose structures are almost the same as each other. The 1 molecules form a one dimensionally stacked column with alternation of their molecular axis direction, while the counteranions are aligned in parallel with the 1-stacked columns with the direction of their distorted-tetrahedral geometry maintained. The room-temperature electrical conductivities measured on the single crystals of 12·FeBr4 and 12·GaBr4 were 4.6 and 2.1 S cm-1, respectively. From the temperature dependences of their electrical conductivities in both cases the electrical conducting properties were metallic between ca. 170 and 300 K, but below ca. 170 K converted to be semiconducting and continued till 5 K, although the activation energies are very small (4-10 meV). For 12·FeBr4 very weak and antiferromagnetic interaction occurred between the d spins of FeBr4- ions in the temperature range of ca. 1-300 K. However, below ca. 15 K the ferromagnetic interaction was reversely preferential possibly by participation of the π spin of 1.

Original languageEnglish
Pages (from-to)4763-4769
Number of pages7
JournalInorganic chemistry
Volume41
Issue number18
DOIs
Publication statusPublished - 2002 Sep 9
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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