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Photoreaction Behaviors of Two Liquid Crystalline Cinnamoyl Compounds with Di?erent Phase in Solution and Mesomorphic States
董晓明,郭金宝,魏杰*
Author NameAffiliationE-mail
董晓明 College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China  
郭金宝 College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China  
魏杰* College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China weijie-2008@hotmail.com 
Abstract:
A novel nematic liquid crystal compound containing a cinnamoyl moiety (PCPC) and a typically cholesteric liquid crystal cholesteryl cinnamate (CC) were synthesized to explore the mechanism ofcinnamoyl compounds, and the chemical structures of photodimerization were confirmed by Fourier transform infrared spectroscopy and 1H nuclear magnetic reso-nance spectral analysis. The photoreaction behaviors of these two cinnamoyl compounds in mesomorphic state and solution were investigated, UV-Vis spectral analysis was used to analyze the photoproduct. The results show that the photochemistry of PCPC in nematic state involves both photodimerization and photoisomerization, while CC shows a complex reaction which can be divided into three parts, and this has enabled us to present new data and interpretations regarding the [2+2] photocycloaddition reaction. Additionally, the re-sults of UV-Vis spectral analysis in solutions strongly suggest that UV-Vis spectral analysis can be used to study the kinetic behaviors of cinnamoyl moiety photoreaction.
Key words:  Cinnamoyl compound, Liquid crystal, Photoreaction behavior
FundProject:
两种不同液晶相肉桂酸酯在溶液态及液晶态的光化学反应
Xiao-ming Dong,Jin-bao Guo,Jie Wei*
摘要:
采用紫外可见分光光度计,研究了两种肉桂酸酯类化合物在液晶态及溶液态的光化学行为. 结果表明,在液晶态下紫外曝光,向列相液晶同时发生光二聚和光异构;而胆甾相液晶将会发生可以被分为三个阶段的相对比较复杂的光化学反应. 同时,溶液态光化学反应的结果表明,紫外光谱分析可以对肉桂酸酯光化学反应进行动力学分析.
关键词:  肉桂酸酯,液晶,光化学
DOI:10.1088/1674-0068/23/06/719-725
分类号: