A new multi-electrochromic 2,7 linked polycarbazole derivative: Effect of the nitro subunit


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Koyuncu F. B. , Koyuncu S., Özdemir E.

ORGANIC ELECTRONICS, vol.12, pp.1701-1710, 2011 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12
  • Publication Date: 2011
  • Doi Number: 10.1016/j.orgel.2011.06.023
  • Journal Name: ORGANIC ELECTRONICS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1701-1710
  • Keywords: Poly-2,7-carbazoles, Electrochemical polymerization, Electrochromic polymers, LOW-BAND-GAP, CONJUGATED POLYMERS, OPTICAL-PROPERTIES, DONOR, CELLS, DEVICES, FILMS, STATE, POLYTHIOPHENE, FLUORESCENCE

Abstract

A new poly-2,7-di-2-thienyl-9H-carbazole derivative (poly(TCT-N)) bearing nitro (-NO2) subunit has been reported. The electrochemical and optical properties of TCT-N monomer and its polymer have been compared to the 9-phenyl-2,7-di-2-thienyl-9H-carbazole (TCT) standard molecule. Cyclic voltammetry revealed that TCT-N and TCT have excellent polymerization activity; due to extended conjugation with the attached thiophene unit and also their low oxidation potentials. The oxidation potential of TCT-N is higher than that of TCT, because of electro-withdrawing effect of -NO2 moiety. Besides, the TCT-N polymeric film prepared via electrochemical process exhibits a multi-electrochromic behavior compared with TCT standard molecule. The electroactive orange color of poly-TCT-N film converted respectively to green, turquoise and dark blue upon applied positive potentials. Consequently, the polymeric electrochrome exhibits multi-electrochromic behavior, high redox stability, high coloration efficiency and reasonable response time for electrochromic applications. (C) 2011 Elsevier B.V. All rights reserved.