Abstract
A 2,5-di(thienyl)pyrrole derivative bearing a dansyl substituent (SNSD) was prepared by a simple synthetic route and its copolymerization with 3,4-ethylenedioxythiophene (EDOT) was successfully performed electrochemically in acetonitrile (CH3CN) containing tetrabutylammonium tetrafluoroborate ((C4H9)4NBF4). The electrochromic properties of the P(SNSD-co-EDOT) films were investigated by spectroelectrochemical techniques and, besides high absorption in the near infrared region, such films presented multielectrochromism with rainbow-like colors depending on the applied potential, as can be seen in the track of the CIE 1931 xy chromaticity coordinates. P(SNSD-co-EDOT) films deposited on ITO with 1:5 feed ratio presented chromatic contrast (Δ%T) at 560 and 990 nm of 25.1 and 35.3, respectively, coloration efficiency (η) in the range of 110 – 180 cm2 C−1, fast switching time (< 1.0 s), and stability to redox cycling. Such properties make this copolymer potentially applicable as active layer in optoelectronic devices.
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