Multielectrochromic Amide-Based Poly(2,5-Dithienylpyrrole) Bearing A Fluorene Derivative: Synthesis, Characterization, And Optoelectronic Properties

A novel 2,5-dithienylpyrrole derivative bearing a fluorene substituent (SNSFCA) was synthesized and successfully electropolymerized on ITO electrodes in acetonitrile (CH3CN) containing tetrabutylammonium tetrafluoroborate ((C4H9)(4)NBF4). The fluorescence properties of SNSFCA and its polymer (PSNSFCA) were investigated upon laser excitation at 337 nm, however, the polymer was not fluorescent, which may be explained by DFT methods. PSNSFCA films present multielectrochromism in a narrow range of applied potential (0.0 <= E <= 0.4 V vs. Ag/Ag-1), as shown by the track of the CIE 1931 xy chromaticity coordinates, besides high absorption in the near infrared (NIR) region. The electrochromic properties of PSNSFCA films, such as good chromatic contrast (Delta%T), coloration efficiency (eta) in the range of 110-350 cm(2) C-1, and stability to redox cycling aroused the possibility of its application as an electrochromic material in optoelectronic devices. (C) 2021 Elsevier Ltd. All rights reserved.