A Tris-fused Tetrathiafulvalene Analog Composed of an Anthraquinoid- and Two Vinyl-extended Tetrathiafulvalenes

Derivatives of a new tris-fused donor composed of two vinyl-extended TTF (EBDT) units and one extended TTF with an anthraquinoid spacer (TTFAQ) (3a–c and 4a) were successfully synthesized. X-ray structure analysis of the tetrakis(methylsulfanyl) derivative 3b revealed that the TTFAQ unit adopts the so-called saddle conformation similar to most the neutral TTFAQs, and that half of the 3b molecules are stacked with each other. Cyclic voltammetry suggested that two positive charges in 3b2+ and 4a2+ were mainly distributed on the EBDT units, while two positive charges of 3c2+ were mainly located on the TTFAQ unit.