Abstract
Two star-shaped oligothiophene derivatives with triphenylamine as core, Tris[4-(2-thienyl)- phenyl]amine (3TPA) and Tris[4-(5-cyano-2-thienyl)-phenyl]amine (3TPA-3CN) were synthesized and characterized for photophysical, electrochemical and electrochromic properties. The results show that introduction of cyano group to the α-position of thiophene unit of 3TPA-3CN makes the maximum absorption red-shifted in comparison with those of 3TPA, but leads the oxidation potentials shift to positive value. Two electrochromic devices were fabricated using 3TPA and 3TPA-3CN as electroactive layer, and the electrochromic properties of both compounds were studied. 3TPA-3CN exhibits reversible, clear color change from yellow to orange on electrochemical doping and dedoping. 3TPA is electropolymerized firstly, and then switches the colors when the applied potential changes.
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