New organic superconductors with an incommensurate anion. Lattice consisting of polyhalide chains (MDT-TSF)Xy (MDT-TSF = methylenedithiotetraselenafulvalene; X = halogen; y = 1.27-1.29)

Kazuo Takimiya, Mie Kodani, Yoshiro Kataoka, Yoshio Aso, Tetsuo Otsubo, Tadashi Kawamoto, Takehiko Mori

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32 Citations (Scopus)

Abstract

The title radical cation salts of MDT-TSF (methylenedithiotetraselenafulvalene) with polyhalide anions prepared by electrocrystallization in the presence of various tetrabutylammonium trihalides show high conductivity at room temperature (> 103 S cm -1) and become superconductors at below 4.0-5.5 K under ambient pressure. Their crystal structures elucidated by X-ray structural analysis are characterized by quasi two-dimensional conducting sheets consisting of uniform donor stacks. Their X-ray oscillation photographs reveal the existence of an incommensurate anion lattice originating from the infinite polyhalide chains. The chemical composition of these salts, as determined on the basis of the X-ray photographs together with the combustion elemental analyses, is (MDT-TSF)X1.27-1.29 (X = halogen). Considering that the most probable charged unit in the polyhalide chain is the trihalide (X 3-), the charge-transfer degree on each donor molecule is estimated to be nonstoichiometric, 0.42-0.43.

Original languageEnglish
Pages (from-to)3250-3255
Number of pages6
JournalChemistry of Materials
Volume15
Issue number17
DOIs
Publication statusPublished - 2003 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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