Synthesis And Properties Of The Star-Shaped Electrochromic Material

The conjugated oligothiophene derivatives have drawn numerous interesting due to their excellent optical properties and conductivity. With the aim of developing new properties and getting wider application of the conjugated oligothiophene derivatives, new star-shaped conjugated oligothiophene derivatives, 1,3,5-Tri(2′-thienyl)benzene(3TB), 1,3,5-Tri(3′′,4′′-ethylenedioxythineyl-2′-thienyl) benzene(3EB), 1,3,5-Tri[5′,2′′-(3′′,4′′-ethylenedioxythineyl)-2′-thienyl] benzene(3ETB) were designed and synthesized. The structures of the compounds were confirmed by MS, 1H-NMR, 13C-NMR, IR and DSC. The chemical structures of the conjugated oligothiophene derivatives are listed as followings: The photophysical and electrochemical properties of these conjugated oligothiophene derivatives were measured by UV-Vis absorption spectra, fluorescence spectra and cyclic voltammetry, and the relationship between molecular structure and optoelectronic properties was investigated. Using 3TB, 3EB and 3ETB as an active materials, respectively, the electrochromic devices through vacuum evaporation were fabricated, and their electrochromic properties were investigated. The results showed that all the compounds exhibited good electrochromic properties. Polythiophene derivatives were also prepared via the electropolymerization based on 3EB and 3ETB, and the results showed that P3 EB and P3 ETB film exhibited good electrochromic properties. The response time of the glass electrochromic device based on the P3 ETB was 0.9s, and the flexibility electrochromic device based on the P3 ETB was 8.5s.