Citation: YU Zhen-Qiang, ZHANG Xin, LI Zi-Chen, CHEN Er-Qiang, LAM Jacky W. Y., TANG Ben-Zhong. Fluorescence Behavior of Biphenyl Containing Side-Chain Liquid Crystalline Polyacetylene with Various Lengths of Spacers[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2281-2285. doi: 10.3866/PKU.WHXB20100848 shu

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

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 Date: 13 May 2010
Available Online: 9 July 2010
Fund Project: 国家自然科学基金(20129001) (20129001) 香港研究资助局(CA05/06.SC02) (CA05/06.SC02)深圳大学青年基金(200824)资助项目 (200824)

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.
- Steady state fluorescence,
- Monosubstituted polyacetylene,
- Biphenyl,
- Fluorescence lifetime,
- Solvent effect
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