Electrochemical Synthesis and Research of Two Polymers Composed of Alternate Carbazole and Thiophene Units

Two organic conjugated molecules composed of central carbazole and bithiophene groups were prepared via the Stille coupling reaction, conductive polymers were prepared by elec-trochemical method. Structure and photoelectric research of polymers were investigated. ¹H NMR and ¹³C NMR of molecules were consistent with the theorical results, FT-IR showed electrochemical polymeric site were α-position of thiophene units. The smooth morphology and distributed holes were beneficial to improve the electrical conductivity by SEM. When applied voltage was from -0.1 V to 1.2 V, both of the polymer films P1 and P2 showed good electrochromic performances. Compared with P1, P2 had better electrochemical stability and thermal stability due to the better coplanarity by repeated cyclic voltammograms and TGA. The P2 was a promising material in the electrochemical field, meanwhile, it showed that the monomer structure had greatly impact on the performance of polymer.