物理化学学报 >> 2010, Vol. 26 >> Issue (08): 2281-2285.doi: 10.3866/PKU.WHXB20100848

光化学与光谱 上一篇    下一篇

具有不同长度间隔基的含联苯基团的侧链液晶聚炔的荧光行为

余振强1,2, 张昕1, 李子臣1, 陈尔强1, LAMJacky W. Y.3, 唐本忠3   

  1. 1. 北京大学化学与分子工程学院高分子科学与工程系, 高分子化学与物理教育部重点实验室, 北京分子科学国家实验室, 北京100871;
    2. 深圳大学化学与化工学院, 深圳市功能高分子重点实验室, 广东 深圳 518060;
    3. 香港科技大学化学系,香港 九龙
  • 收稿日期:2010-05-13 修回日期:2010-07-08 发布日期:2010-07-23
  • 通讯作者: 余振强, 陈尔强 E-mail:zqyu@szu.edu.cn; eqchen@pku.edu.cn
  • 基金资助:

    国家自然科学基金(20129001), 香港研究资助局(CA05/06.SC02)和深圳大学青年基金(200824)资助项目

Fluorescence Behavior of Biphenyl Containing Side-Chain Liquid Crystalline Polyacetylene with Various Lengths of Spacers

YU Zhen-Qiang1,2, ZHANG Xin1, LI Zi-Chen1, CHEN Er-Qiang1, LAM Jacky W. Y.3, TANG Ben-Zhong3   

  1. 1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
    2. School of Chemistry and Chemical Engineering and Shenzhen Key Laboratory of Functional Polymers, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China;
    3. Department of Chemistry, The Hong Kong University of Science & Technology, Kowloon, Hong Kong, P. R. China
  • Received:2010-05-13 Revised:2010-07-08 Published:2010-07-23
  • Contact: YU Zhen-Qiang, CHEN Er-Qiang E-mail:zqyu@szu.edu.cn; eqchen@pku.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20129001), the Research Grants Council of Hong Kong, China (CA05/06.SC02) and R/D Fund of Shenzhen University, China (200824).

摘要:

对一系列具有不同长度间隔基的含联苯基团的侧链液晶聚炔的稳态荧光和荧光衰减行为进行了研究. 为便于比较, 选取其中一个单体作为模型化合物. 稳态荧光光谱结果表明, 聚合物和单体均显示一个荧光发射, 该荧光发射来源于聚合物侧链的联苯基团. 随着间隔基长度的减小, 聚合物的荧光强度降低. 荧光衰减结果表明单体的荧光衰减可以拟合为一个单指数衰减, 而聚合物的荧光衰减拟合为三指数衰减. 这种三指数衰减可能由溶液局部高浓度引起的猝灭和侧链联苯基团的旋转受阻所引起. 溶剂效应表明, 溶剂与联苯基团之间的相互作用随溶剂极性增加而增大.

关键词: 稳态荧光, 单取代聚炔, 联苯, 荧光寿命, 溶剂效应

Abstract:

Steady state fluorescence and fluorescence decay of a series of monosubstituted biphenyl containing side- chain liquid crystalline polyacetylenes with different lengths of spacers were investigated. For comparison, a monomer was selected as a model compound. Steady state fluorescence spectra elucidated that the polymers and the monomer showed single fluorescence emission arising from the biphenyl group on the side chain. With decreasing the length of the spacer, the fluorescence intensity of the polymer decreased accordingly. The fluorescence decay showed that the decay of the monomer could be fitted to be a single-exponential decay, while that of the polymers should be fitted to be a triple-exponential decay, which may be originated from the local high concentration induced quenching and the rotational restriction of the side-chain biphenyl groups. Solvent effects illustrated that the interaction between the solvents and the biphenyl groups strengthened with increasing the polarity of the solvents.

Key words: Steady state fluorescence, Monosubstituted polyacetylene, Biphenyl, Fluorescence lifetime, Solvent effect

MSC2000: 

  • O644