Synthesis of a novel donor, BETE-DMB, and its properties

A novel donor, 1,4-bis[2-(6,7-ethylenedithio-1,4,5,8-tetrathifulvalen-2-yl)ethenyl]-2,5-dimethylbenzene; BETE-DMB (1), was synthesized. Its extended π-electron conjugation was confirmed from the electrochemical behaviour. The electrical conductivity of the needle shape single crystals of BETE-DMB/IBr2 is 80 Scm−1 at room temperature, and shows metallic behaviour down to ca. 230 K.