Abstract
the 1 H NMR spectra (Figure S1), based on the terminal methyl groups of the butyl and octyl side chains which showed resonances at 1.0 and 0.9 ppm, respectively. The regioregularity of both BO samples was determined to be 94% by using the resonance of the R-methylene protons. 1a,b The number-average molecular weights (Mn) of BO50 and BO76 were 17 300 and 11 400 g/mol, with a polydispersity index of 1.69 and 1.60, respectively, by gel permeation chromatography (GPC) analysis. The large polydispersity indices are a result of the poor selectivity of activation by isopropylmagnesium chloride of 2,5dibromo-3-octylthiophene and 2,5-dibromo-3-butylthiophene. The polydispersity index could be potentially reduced by using the asymmetric 2-bromo-5-iodo-3-alkylthiophene as the starting monomer. 8
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