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


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

ORGANIC ELECTRONICS, cilt.12, ss.1701-1710, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 12 Konu: 10
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.orgel.2011.06.023
  • Dergi Adı: ORGANIC ELECTRONICS
  • Sayfa Sayıları: ss.1701-1710

Özet

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.