Abstract
The reductive preparation of poly(thiophene) and copolymers from 2,5-dibromothiophene and tetrabromothiophene is described. In this reaction, hydrazine and palladium catalysts were used. Yield of the polymer was 65% when 2,5-dibromothiophene was used as a monomer. Electric conductivity of the polymer was 1×10−5 S cm−1 (I2 20 wt%) and 1×10−3 S cm−1 (I2 50 wt%). The polymer had 1.6 wt% of bromine residue. As the mixing ratio of 2,5-dibromothiophene to tetrabromothiophene decreased, yield of the polymer decreased. A polymer from tetrabromothiophene gave yield of 41%. As for electric conductivity, the polymer prepared from only 2,5-dibromothiophene gave a higher value than copolymers of 2,5-dibromothiophene and tetrabromothiophene. Increasing the a mixing ratio of tetrabromothiophene caused a decrease of the conductivity. The polymer from tetrabromothiophene gave electric conductivity of ∼10−6—10−7 S cm−1 (I2 20 wt%).
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Kitada, K., Ozaki, S. Reductive Polymerization of Halothiophene. Polym J 27, 1161–1166 (1995). https://doi.org/10.1295/polymj.27.1161
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DOI: https://doi.org/10.1295/polymj.27.1161