SPECTROELECTROCHEMICAL PROPERTIES OF LINEAR AND STAR-SHAPED TRIPHENYLAMINE OLIGOVINYLENES

Three electroactive oligomers with linear and star-shaped structure containing triphenylamine moieties as ending group and/or core unit connected by vinylene segments were characterized in terms of the electrochemical polymerization and spectroelectrochemical behavior. Using cyclic voltammetry technique the oligomers were electropolymerized and deposited as electroactive polymeric films on the electrode surface. The polymers films have excellent electrochemical stability and exhibit color changes while the potential of the working electrode is swept between 0.0 V and 1.8 V. These color changes may be associated to various oxidation states that undergo the polymers during the oxidation/reduction processes. The electrochromic behavior of polymers was monitored, and the results confirm that the electrodeposited films present very good electrochromic properties preserving their electrochromic parameters even after a number of 45 continuous cycles operations. It can be anticipated that all three polymers can find applications in electrochromic devices, optical displays, smart windows or sensors.