Synthesis and structures of highly conducting charge-transfer salts of selenium containing TTM-TTP derivatives

Minoru Ashizawa, Akane Akutsu, Bunpei Noda, Hirofumi Nii, Tadashi Kawamoto, Takehiko Mori, Takashi Nakayashiki, Yohji Misaki, Kazuyoshi Tanaka, Kazuo Takimiya, Tetsuo Otsubo

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Selenium-substituted TTM-TTP (2,5-bis[4,5-bis(methylthio)-1,3-dithiol-2- ylidene]-1,3,4,6-tetrathiapentalene) derivatives (1a-1d), in which several 1,3-dithiole rings of the bis-fused TTF framework are replaced by 1,3-diselenole rings, have been prepared. In particular, we have accomplished the first selenium substitution of the inner TTP part (1a). The 1:1 composition iodine salt, (1a)I3, is an insulator constructed of the donor trimers. The 1:1 GaCl4 salt, (1a)GaCl4, has a uniform column isostructural to the sulfur analog, (TTM-TTP)FeBr1.8Cl2.2; it exhibits metallic conduction down to about 60 K, the lowest metal-insulator (M-I) transition temperature in 1:1 salts. The donors 1c and 1d give the iodine salts isostructural to the sulfur analog, (TTM-TTP)(I3) 5/3. By the selenium substitution, the M-I transition of (1d)(I 3)5/3 is entirely suppressed.

Original languageEnglish
Pages (from-to)1449-1458
Number of pages10
JournalBulletin of the Chemical Society of Japan
Volume77
Issue number8
DOIs
Publication statusPublished - 2004 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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