Here, we show the electrochemical polymerization and characteristic of six p-phenylene derivatives. The electroactive co-monomers and polymers containing furan, thiophene, selenophene units are studied using electrochemical techniques (differential pulse voltammetry, cyclic voltammetry, electrochemical deposition, and voltabsorptiometry) in order to characterize layers, charge carriers and energy electronic levels. The possibility of use such polymers as electrochromic windows is presented. Simple evaluation of charge carriers helps to explain the long switching time of electrochromic window.