Influence of terminal alkyl chain length on helical twisting property of chiral 1,2-propanediol derivatives  

作　　者：Wei Huang Guang Da Yang Zhen Yu Bian Xiao Juan Wu Guo Jing Ma Qi Huang Huai Yang 

机构地区：[1]Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]National Laboratory of Electro-Optics System Technology, Hebei 065201, China [3]China Classification Society Certification Company, Beijing 100006, China

出　　处：《Chinese Chemical Letters》2009年第12期1435-1438,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation(No.20674005);the Flat-Panel Display Special Project of China 863 Plan(No.2008AA03A318);Projects of Chinese National Science and Technology Tackling Key Problems(No.2007BAE31B02);Program of National Laboratory of Electro-Optics System Technology(No.9140C150102090C1501).

摘　　要：In this study, a novel series of chiral 1,2-propanediol derivatives with different terminal alkyl chain length were synthesized and characterized by FT-IR, ^1H NMR and DSC. After doped into a nematic liquid crystal host, all the chiral dopants induced chiral nematic liquid crystals exhibiting a helix inversion with temperature variation. The results indicate that terminal alkyl chain length has a prominent influence on helical twisting property of the chiral dopants. With increasing the terminal alkyl chain length, the molecular twisting power increases, the helix inversion temperatures varies slightly while the phase transition temperature decreases. An odd-even effect may exist in the molecular twisting power of the chirai dopants.In this study, a novel series of chiral 1,2-propanediol derivatives with different terminal alkyl chain length were synthesized and characterized by FT-IR, ^1H NMR and DSC. After doped into a nematic liquid crystal host, all the chiral dopants induced chiral nematic liquid crystals exhibiting a helix inversion with temperature variation. The results indicate that terminal alkyl chain length has a prominent influence on helical twisting property of the chiral dopants. With increasing the terminal alkyl chain length, the molecular twisting power increases, the helix inversion temperatures varies slightly while the phase transition temperature decreases. An odd-even effect may exist in the molecular twisting power of the chirai dopants.

关 键 词：Chiral dopant Liquid crystal Helix inversion Molecular twisting power 

分 类 号：O636.1[理学—高分子化学] TQ423.12[理学—化学]