Synthesis and properties of novel unsymmetrical tetraselenafulvalene donors, EDT-PT-TSF and EDT-PS-TSF

Kazuo Takimiya, Satoshi Murakami, Mie Kodani, Yoshio Aso, Tetsuo Otsubo

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

In order to develop novel electron donors, by structural modification to a superior electron donor, bis(ethylenedithio)-tetraselenafulvalene (BETS 2), unsymmetrical TSF derivatives ethylenedithio-propylenethio-TSF (EDT-PT-TSF 5) and ethylenedithio-propyleneseleno-TSF (EDT-PS-TSF 6) have been effectively synthesized. The synthetic method involves a one-pot formation of 1,3-diselenole-2-selones from acetylene derivatives, a cross-coupling to the TSF system, and finally a ring construction of the outer heterocycles. Electro-crystallization of S affords a series of conductive radical cation salts with BF4-, PF6-, AsF 6-, ClO4-, and SbF6 - anions, which are of the 2:1 or 3:2 composition ratio. All of the salts with 2:1 ratio are stable metals down to 4.2K without any specific phase transitions. X-ray crystallographic analyses confirm that they have so-called K-type donor arrangements.

Keywords

  • Organic conductor
  • Tetraselenafulvalene: radical cation salt
  • X-ray crystallographic analysis

ASJC Scopus subject areas

  • Condensed Matter Physics

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