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

作者：Koyuncu Fatma Baycan^*; Koyuncu Sermet; Ozdemir Eyup

来源：Organic Electronics, 2011, 12(10): 1701-1710.

DOI：10.1016/j.orgel.2011.06.023

• Poly-2,7-carbazoles
• Electrochemical polymerization
• Electrochromic polymers

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.

• 出版日期2011-10