高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (9): 1747.

• 研究论文 • 上一篇    下一篇

窄能隙共轭聚合物:聚[(3-烷基)噻吩-2,5]-取代苯甲烯衍生物的合成与表征

高潮, 吴洪才, 易文辉, 李宝铭, 孙建平   

  1. 西安交通大学电子信息工程学院, 西安710049
  • 收稿日期:2003-09-28 出版日期:2004-09-24 发布日期:2004-09-24
  • 基金资助:

    国家自然科学基金(批准号:60277002);西安交通大学科研基金资助

Synthesis and Characterization of Narrow Bandgap Conjugated Polymer: Poly[(3-alkylthiophene-2,5-diyl)][(p-substituted) benzylidenequinomethane-2,5-diyl]s

GAO Chao, WU Hong-Cai, YI Wen-Hui, LI Bao-Ming, SUN Jian-Ping   

  1. School of Electronics and Information Engineering, Xi′an Jiaotong University, Xi′an, 710049, China
  • Received:2003-09-28 Online:2004-09-24 Published:2004-09-24

摘要: 合成了3-丁基噻吩和3-辛基噻吩,并分别与对硝基苯甲醛和对二甲氨基苯甲醛进行聚合反应得到了具有极低能隙的聚(3-丁基噻吩)对硝基苯甲烯(PBTNBQ)、聚(3-丁基噻吩)对二甲氨基苯甲烯(PBTDMABQ)和聚(3-辛基噻吩)对二甲氨基苯甲烯(POTDMABQ).采用红外光谱、核磁共振氢谱和紫外-可见吸收光谱确认了产物的结构,发现中间产物聚(3-烷基)噻吩取代苯甲烷衍生物中存在部分醌化产物.根据Eg与入射光子能量hν的关系,采用2种模型计算了3种聚合物薄膜的光学禁带宽度为PBTNBQ1.63,1.84eV;PBTDMABQ1.44,1.75eV和POTDMABQ1.32,1.69eV,属窄能隙共轭聚合物.

关键词: 聚[(3-烷基)噻吩-2, 5]苯甲烯, 窄能隙共轭聚合物, 带隙宽度, 合成, 表征

Abstract: Poly[(thiophene)methene]s are the conjugated polymer with very narrow bandgap. Three poly[(3-alkylthiophene)methane]s: poly[(3-butylthiophene-2,5-diyl)][(p-nitro)benzylidenequinomethane-2,5-diyl](PBTNBQ), poly[(3-butylthiophene-2,5-diyl)][(p-N,N-dimethyl-amino)benzylidenequinomethane-2,5-diyl](PBTDMABQ) and poly[(3-octylthiophene-2,5-diyl)][( p-N,N-dimethylamino)benzylidenequinomethane-2,5-diyl](POTDMABQ) are synthesized through three steps. The products are then characterized by IR spectrum, UV-Vis absorption spectrum and 1H NMR. The results indicate that there is a part quino-structure in poly[(3-alkylthiophene-2,5-diyl)benzylidene](PATB). The absorption peak at 1 653 cm-1 in IR spectrum, the enlarged absorption of 450-600 nm in UV-Vis absorption spectrum imply that the quino-structure is really formed in this three conjugated polymers. According to the function ofEgand hν, the bandgaps of these three polymers are calculated by two models which show theEgas 1.63 and 1.84 eV for PBTNBQ, 1.44 and 1.75 eV for PBTDMABQ, 1.32 and 1.69 eV for POTDMABQ, respectively.

Key words: Poly[(3-alkylthiophene)methene]s, Narrow bandgap conjugated polymer, Band gap width, Synthesis, Characterization

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