Structures and transport properties of new molecular conductors based on TMEO-ST-TTP

Yohji Misaki, Masateru Taniguchi, Kazuyoshi Tanaka, Kazuo Takimiya, Atsushi Morikami, Tetsuo Otsubo, Takehiko Mori

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Several radical cation salts based on TMEO-ST-TTP (2-[4,5-bis(methylthio)-1,3-diselenol-2-ylidene]-5-(4,5-ethylendioxy-1,3- dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) have been prepared. X-ray structure analyses of (TMEO-ST-TTP)2X (X = PF6, AsF6, TaF6) reveal that they have the so-called β-type array of donors with dimerized stacks. A tight-binding band calculation suggests that the present salts have a quasi-one-dimensional Fermi surface. On the other hand (TMEO-ST-TTP)Au(CN)2 has strongly dimerized one-dimensional electronic structure. (TMEO-ST-TTP)2X (X = PF6, AsF6, TaF6) exhibit a high conductivity of σrt = 100 - 101 S cm-1, and retain metallic conductivity down to 4.2 K, while the tetrahedral (ReO4-) and linear (I3- and Au(CN)2-) anions give semiconductors. Thermoelectric power of (TMEO-ST-TTP)2PF6 shows T-linear temperature dependence characteristic of a metal.

Original languageEnglish
Pages (from-to)608-615
Number of pages8
JournalJournal of Solid State Chemistry
Volume168
Issue number2
DOIs
Publication statusPublished - 2002 Nov 1
Externally publishedYes

Keywords

  • Band calculation
  • Electrical conductivity
  • Organic metal
  • Radical cation salts
  • Tetrathiapentalene
  • Thermoelectric power
  • X-ray structure analysis
  • π-electron donor

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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