The effect of heteroatom conformation on optoelectronic properties of cyclopentadithiophene derivativesElectronic supplementary information (ESI) available: Experimental procedures, cyclic voltammograms and thermal analyses. See DOI: 10.1039/c3ob41648h

Cyclopentadithiophene (CPDT) derivatives with different heteroatom conformations have been synthesized. The optical, electrochemical and charge transport properties of these molecules are reported. The CPDT- anti -ketone not only exhibits the lowest optical and electronic bandgaps, but also exhibits reasonable hole mobility, 3 × 10 −3 cm 2 (V s) −1 . Changing the carbonyl conformation to the syn position or incorporating the imine functionality results in a blue-shift in the lower energy band of the absorption spectrum indicative of the increased bandgaps. Cyclopentadithiophene (CPDT) derivatives with different heteroatom conformations have been synthesized.