Ethylenedioxy Substituted 2,5-Bis(1′,3′-dithiol-2′-ylidene)-1,3,4,6-tetrathiapentalenes and Their Conducting Salts

The title compounds were prepared and their electrochemical properties were investigated. Several cation radical salts composed of them showed metallic conductive behavior down to 0.6 K. The X-ray crystal structure of AsF6 salt of ethylenedithio derivative, (EOET-TTP)3AsF6, revealed that the donors have “κ-type” arrangement in the conducting sheet.