Extended Oligothienylenevinylenes End-Capped with 1,4-Dithiafulvenyl π-Donor Groups: Toward a Supramolecular Control of Effective Conjugation Length

Oligothienylenevinylenes (nTVs) have potential as molecular wires because of their long effective conjugation lengths. The synthesis of a series of nTVs end-capped with 1,4-dithiafulvenyl π-donor groups (n = 8 in the Figure)—the longest TTF analogues ever reported — is described. The donor groups are shown to enhance interchain interactions in the solid state, leading to a significant reduction of the bandgap.