Add time:07/12/2019         Source:sciencedirect.com

A 4-(furan-2-yl)phenyl-containing conjugated dithienylpyrrole (FPT) was prepared using a Paal-Knorr reaction and its homologous homopolymer (PFPT) and copolymers (P(FPT-co-DTC) and P(FPT-co-DTP)) were electrosynthesized. Spectroelectrochemical investigations displayed that PFPT film was saffron yellow (0 V) in a reduced state, yellowish-gray (1.0 V), light purple (1.2 V), and bluish-purple (1.4 V) in an oxidized state. P(FPT-co-DTC) film was green, grayish-green, grayish-blue, and bluish-purple from reduced to oxidized states. Electrochromic switching studies revealed the transmittance change (ΔT) of PFPT, P(FPT-co-DTC), and P(FPT-co-DTP) films were 22.7%, 44.8%, and 50.7% at 1320 nm, 906 nm, and 1212 nm, respectively, and the coloration efficiency (η) of PFPT, P(FPT-co-DTC), and P(FPT-co-DTP) films were estimated to be 181.8 cm2 C−1, 229.0 cm2 C−1, and 232.4 cm2 C−1 at 1320 nm, 906 nm, and 1212 nm, respectively. A P(FPT-co-DTP)/PProDOT-Et2 ECD revealed a high ΔT (38.6% at 612 nm) and rapid switching time, whereas a PFPT/PProDOT-Et2 ECD attained a high ΔT (33.3% at 590 nm), a high η (533.5 cm2 C−1 at 590 nm) and long-term reversible redox behaviors.

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