Preparation and properties of a new conducting polyheterocycle: Polydithieno [3, 4-b : 3′, 4′-d] thiophene (PDTT) (original) (raw)

Conductive polyheterocyclic systems exhibiting different properties may be obtained by modifying the molecular architecture of the monomer units. Lowering the band gap value one can also achieve an intrinsically conducting polymer without the need of doping. Pursuing these objectives and on the basis of the experience on the fused thiophene-ring series , we have chosen the dithieno-[3,4-b:3',4'-d]thiophene molecule as the building block for the following reasons: a) the large delocalization of ~-electrons as compared to thiophene based monomers, b) the availability of specific and equivalent sites for the polymer propagation (a-positions with respect to the sulphur atom).