Abstract
We synthesized poly(3-alkoxy-4-methylthiophene)s (PMThO) by conventional oxidative polymerization using iron trichloride to investigate the effect of length of the alkoxy chain introduced into the 3-position of the thiophene ring on the physical properties. Regioregular PMThO derivatives were obtained and the regioregularity of PMThO derivatives was confirmed by 1H NMR and 13C NMR measurements. In the UV–vis spectra of PMThO derivatives, vibronic peaks characteristic of the regioregular polythiophene derivatives were observed around 540 nm, and new peaks of 275 nm and 400 nm assigned to the PMThO derivatives with non-planar conformation for the polymer backbone appeared with increasing temperature. The band gap energy of PMThO derivatives was about 1.9 eV that was lower than that of conventional polythiophenes. The electrical conductivity of doped PMThO derivatives bearing longer alkoxy chains was about 100 S cm−1.
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Tanaka, K., Mihara, T. & Koide, N. Synthesis and Physical Properties of Regioregular Poly(3-alkoxy-4-methylthiophene)s. Polym J 36, 628–633 (2004). https://doi.org/10.1295/polymj.36.628
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DOI: https://doi.org/10.1295/polymj.36.628