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Abstract
1,4-Bis(2-thienyl)benzene (T14B), 2,5-bis(2-thienyl)pyridine (T25P), and 2,6-bis(2-thienyl)pyridine (T26P) were electrochemically polymerized. The conductivity of poly-T14B, poly-T25P, and poly-T26P was 1.7 × 10−1, 2.6 × 10−8, and 1.2 × 10−7 S/cm, respectively. A poly-T26P film has a very even surface and is composed of fibrils growing on a thin, dense layer. Infrared spectra showed the monomer units to be linked through the 5,5′-positions of the thiophene rings. On electrochemical oxidation, poly-T26P became a quaternary ammonium salt. Visible/near-infrared spectra of poly-T14B showed that bipolaron states were formed. The conductivities of poly-T25P and poly-T26P rose to about 10−2 S/cm by iodine doping, irrespective of the bonding sites of pyridine.