“…In another example, Zagorska et al [29] have synthesized copolymers based on 3-alkylthiophenes and thiophene functionalized with an azo chromophore leading to a mix of electrochromic properties. Alakhras has also published a work presenting new copolymers obtained potentiostatically from selenophene and thiophene units, which provided changes on the electro-optical properties [30] . Another work mentions the preparation of a copolymer of 2,5-di(thiophen-2-yl)-1-p-tolyl-1H-pyrrole (DTTP) with 3,4-ethylenedioxythiophene (EDOT) [31] .…”