Neutral-State Green Conjugated Polymers from Pyrrole Bis-Substituted Benzothiadiazole and Benzoselenadiazole for Electrochromic Devices


Baran D., Oktem G., Celebi S., TOPPARE L. K.

MACROMOLECULAR CHEMISTRY AND PHYSICS, vol.212, no.8, pp.799-805, 2011 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 212 Issue: 8
  • Publication Date: 2011
  • Doi Number: 10.1002/macp.201000744
  • Journal Name: MACROMOLECULAR CHEMISTRY AND PHYSICS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.799-805
  • Keywords: benzoselenadiazole, benzothiadiazole, conjugated polymers, electrochromism, pyrroles, DONOR-ACCEPTOR APPROACH, SOLAR-CELLS, ELECTROCHEMICAL PROPERTIES, COPOLYMERS, THIOPHENE, MOIETY, UNIT, GAP, RED

Abstract

Two donor/acceptor/donor-type pyrrole-incorporated monomers, 4,7-di(1H-pyrrol-2-yl)benzo[c][1,2,5]thiadiazole (M1) and 4,7-di(1H-pyrrol-2-yl) benzo[c][1,2,5] selenadiazole (M2), were synthesized and polymerized electrochemically. The resulting polymers (P1 and P2) were investigated in terms of their electrochromic and optical properties. Spectroelectrochemistry studies revealed that both polymers show two distinct absorptions in both red and blue regions. The absorptions at around 400 and 700 nm correspond to neutral-state green polymers P1 and P2, which is a unique property for conjugated polymers. Optical band gaps were calculated as 1.12 and 1.08 eV for P1 and P2, respectively.