Regioregular poly(3-hexylthiophene) (rr-P3HT) was synthesized by Heck reaction.The factors that influenced the molecular weight and regioregularity of P3HT were investigated

such as solvents

phase transfer catalysts

catalysts

reaction temperatures and reaction times.The molecular weight and regioregularity of rr-P3HT obtained were characterized with gel permeation chromatography (GPC) and magnetic nuclear resonance (NMR).The properties of rr-P3HT were characterized with ultraviolet absorption spectrum and photo-luminance spectrum.The results showed that rr-P3HT with Mn of 6700 and regioregularity over 96% was obtained by Heck reaction of 2-bromo-3-hexylthiophene when the mixture of DMF/THF(1∶1) was used as solvents

palladium acetate ［5%（mol） to monomer］ as a catalyst

tetrabutylamonium bromide ［100%（mol） to monomer］ as a phase transfer agent and potassium carbonate as a base at reaction temperature of 80℃ for 12 h.