Donor-acceptor-donor type conjugated polymers for electrochromic applications: benzimidazole as the acceptor unit


Akpinar H., Balan A., Baran D., Unver E. K. , Toppare L.

POLYMER, vol.51, no.26, pp.6123-6131, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 51 Issue: 26
  • Publication Date: 2010
  • Doi Number: 10.1016/j.polymer.2010.10.045
  • Title of Journal : POLYMER
  • Page Numbers: pp.6123-6131
  • Keywords: Benzimidazole, Donor-acceptor approach, Electrochromism, BAND-GAP, ELECTROCHEMICAL PROPERTIES, NEUTRAL STATE, CONDUCTIVITY

Abstract

Donor-acceptor-donor (DAD) type benzimidazole (Blm) and 3,4 ethylenedioxythiophene (EDOT) bearing monomers were synthesized and electrochemically polymerized. Pendant group at 2-C position of the imidazole ring was functionalized with phenyl (P1), EDOT (P2) and ferrocene (P3) in order to observe substituent effect on electrochemical and electrochromic properties of corresponding polymers. Spectroelectrochemical results showed that different pendant groups resulted in polymers with slightly different optical band gaps (1.75, 1.69 and 1.77 eV respectively) and different number of achievable colored states. Optoelectronic performance and comparison of results with other well known pi-accepting benzazole bearing DAD type polymers were reported in detail. (C) 2010 Elsevier Ltd. All rights reserved.