Abstract
A series of polythiophene derivatives bearing 3,4-diaryl substituents were synthesized starting from commercially available 3,4-dibromothiophene. The effects of two different aryl substituents, either a 5-octyl-2-thienyl or a 4-octylphenyl, were investigated in this study. To minimize steric effects on polymerization and conjugation, polymers were synthesized with a bithiophene or a triple-bond spacer. The resulting polymers show varying solubility in common organic solvents and their UV-visible absorption spectra in solution exhibit maxima in the range 434–484 nm, which are significantly red-shifted as compared to those of 3,4-dialkyl-substituted polythiophenes. Gel permeation chromatography analysis using polystyrene standards shows a weight-average molecular weight range of 1.50 × 104–4.40 × 104 g mol−1 for the various polymers. Copyright © 2011 Society of Chemical Industry
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