Abstract
2-(1,3-Dithiol-2-ylidene)-5-(2-ethanediylidene-1,3-dithiole)-1,3,4,6-tetrathiapentalene (DTEDT) is of interest in the search for novel organic cnductors, because it has yielded a superconducting Au(CN)2 salt as well as a number of metallic radical cation salts stable down to low temperature. We report herein the synthesis of dimeric DTEDT derivatives 1, in which two DTEDT units are combined with ethylenedithio group, and their electrochemistry. Cyclic voltammogram of hexaethyl-1 is composed of four-pairs of two-electron redox waves at 0.40, 0.69, 0.89, 1.2 V (vs. SCE, in PhCN). The E1 value is lower by 0.04 V compared with that of tetrakis(methylthio)-DTEDT (2), while the ΔE value (0.29 V) is larger by 0.19 V than that of 2. These results suggest relatively strong interaction between two dimeric DTEDT units in oxidation state.
