应用化学 ›› 2009, Vol. 26 ›› Issue (6): 707-710.

• 研究论文 • 上一篇    下一篇

新型p-/n-交替3-烷基噻吩共聚物的合成及其光电性质的研究

王雪梅1,祁争健2   

  1. 1. 江苏省东南大学化学化工学院
    2. 东南大学化学化工学院
  • 收稿日期:2008-06-06 修回日期:2008-08-22 出版日期:2009-06-10 发布日期:2009-06-10
  • 通讯作者: 祁争健

Studies on Synthesis and Electrochemical Activity of Novel p-/n- 3-Alkylthiophene Copolymers

  • Received:2008-06-06 Revised:2008-08-22 Published:2009-06-10 Online:2009-06-10

摘要:

通过Heck偶合法合成了四种新型p-/n-交替3-烷基噻吩共聚物:聚(2,4-二乙烯基-3-己基噻吩-1,3,4-噁二唑) (P3HT-OXD)、聚(2,4-二乙烯基-3-辛基噻吩-1,3,4-噁二唑) (P3OT-OXD)、聚(2,4-二乙烯基-3-己基噻吩-吡啶) (P3HT-Py)、聚(2,4-二乙烯基-3-辛基噻吩-吡啶) (P3OT-Py)。利用NMR、GPC等方法对结构进行了分析表征。采用循环伏安法、紫外-可见吸收光谱法对该系列共聚物的光电性能进行了研究,结果表明:随着噻吩环3位取代烷基碳链的增长,聚合物电离能(Ip)减小,带隙能(Eg)也随之变窄,其中,P3OT-OXD的Eg比P3HT-OXD小0.11ev,P3OT-Py的Eg比P3HT-Py小0.19eV;而在3-烷基噻吩聚合物主链上引入吸电子能力较强的噁二唑单元,可有效提高共聚物电子亲合能(Ea),对提高电子传输能力,改善电子与空穴注入平衡有积极作用

Abstract:

A series of novel p-/n- 3-alkylthiophene copolymers were synthesized by Heck reaction: P3HT-OXD, P3OT-OXD, P3HT-Py and P3OT-Py. They were characterized by NMR, gel permeation chromatography(GPC). The optical properties were investigated using Uv-visspectroscopy and electrochemical properties were measured by cyclic voltammetry. It was found that the ionization potential ( Ip) and band gap(Eg) of copolymers were reduced with an increase of the length of alkyl chain. The band gap of P3HT-OXD, P3OT-OXD , P3HT-Py and P3OT-Py was at 2.80eV, 2.69eV, 3.14eV and 2.95eV. Electron affinity(Ea) of polythiophene containing 1,3,4-oxadiazole in main chain was comparatively high, which will be avail to enhance electron-transporting effect and improve the balanced rates for electron and hole injection