Effect of conjugated core building block dibenzo[a,c]phenazine unit on π‐conjugated electrochromic polymers: Red‐shifted absorption
作者:Elif Kose Unver、Simge Tarkuc、Yasemin Arslan Udum、Cihangir Tanyeli、Levent Toppare
DOI:10.1002/pola.23935
日期:2010.4.15
and electrochemical properties of three different electroactive polymers having a conjugated core building block, dibenzo[a,c]phenazine. A series of monomers has been synthesized as regards to thiophene based units; thiophene, 3‐hexyl thiophene, and 3,4‐ethylenedioxythiophene. The effects of different donor substituents on the polymers' electrochemical properties were examined by cyclic voltammetry
对具有共轭核心构件的两种不同电活性聚合物二苯并[a,c]吩嗪的电合成和电化学性能进行了比较研究。关于基于噻吩的单元,已经合成了一系列单体。噻吩,3-己基噻吩和3,4-乙撑二氧噻吩。通过循环伏安法研究了不同的供体取代基对聚合物电化学性能的影响。向单体中引入高度供电子的(乙二氧基)基团可实现溶解性,同时还降低了氧化电位。单体单元的平面度增强了π堆积,从而降低了E g从2.4 eV(PHTP)到1.7(PTBP)。循环伏安法和光谱电化学测量表明,2,7-双(4-己基噻吩-2-基)二苯并[a,c]吩嗪(HTP)和2,7-双(2,3-二氢噻吩并[3,4-b] [1,4]二恶英-5-基)二苯并[a,c]吩嗪(TBP)具有电致变色行为。比色分析显示,尽管PTBP具有从红色到蓝色的颜色变化,但是PHTP在中性状态下具有黄色,而在氧化状态下具有蓝色。因此,吩嗪衍生物作为受体单元的存在导致聚合物吸收中的红移以具有蓝色。©2010