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Paper | Special issue | Vol 67, No. 2, 2006, pp.655-663
Published online, 30th September, 2005
DOI: 10.3987/COM-05-S(T)48
Synthesis and Properties of Ethylenethiotetraselenafulvalene (ET-TSF) and Its Conductive Radical Cation Salts

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

*Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-hiroshima, Hiroshima 739-8527, Japan


The title heterocycle-fused tetraselenafulvalene derivative, ET-TSF (ethylenethiotetraselenafulvalene) has been synthesized as a novel electron donor. Electrocrystallization of ET-TSF gave highly conductive radical cation salts with I3-, Cl-, Br-, and AuI2- counter anions. Among them, the AuI2 salt isostructural with the organic superconductor (MDT-TSF)-AuI2 (MDT-TSF = methylenedithiotetraselenafulvalene) was highly conductive (1600 S cm-1) and metallic down to 1.8 K with no superconducting transition.