A new electrochromic copolymer composed of 4,7-di(thiophen-2-yl)benzo[c] [1,2,5] thiadiazole and 3,4-ethylenedioxythiophene

A new electrochromic copolymer based on 4,7-di(thiophen-2-yl)benzo[c] [1,2,5]thiadiazole and 3,4-ethylenedioxythiophene was successfully obtained via the electrochemical polymerization method in medium of electrolyte solution, which consists 0.1 M tetrabutylammonium hexafluorophosphate dichloromethane. In order to compare chemical properties copolymer, benzothiodiazole derivative (EDOT) monomers, are parts electrochemically polymerized, separately same environment concentration with copolymer. Poly(4,7-di(thiophen- 2-yl)benzo[c][1,2,5]thiadiazole) (P(TBT)) poly(3,4-ethylenedioxythiophene) (PEDOT) polymers were obtained. Before starting synthesis, initial oxidation potentials monomers that form compared cyclic voltammeter this solvent medium. Then, spectroelectrochemical characterizations synthesized copolymers performed. New shows metallic blue centaury its neutral oxidized states, respectively a low band gap 1.32 eV. Moreover, has 59% optical contrast high coloration efficiency (324 cm2C-1) at 585 nm switching time 2.2 s.