Synthesis and mesomorphic properties of 4-(4-bromopropyloxy)-4'-(4-alkyloxybenzylidene)anilines  

作　　者：Guan-Yeow Yeap Yew-Hong Ooi Kenji Kubo Masato M.Ito 

机构地区：[1]Liquid Crystal Research Laboratory,School of Chemical Sciences,Universiti Sains Malaysia,11800 Minden,Penang,Malaysia [2]Department of Environmental Engineering for Symbiosis,Faculty of Engineering,Soka University,Tokyo 192-8577,Japan

出　　处：《Chinese Chemical Letters》2012年第7期769-772,共4页中国化学快报（英文版）

基　　金：Universiti Sains Malaysia for USM RU(No.1001/PKIMIA/811159) and the research facilities

摘　　要：This article describes the preparation and liquid crystalline properties of a new homologous series of 4-（4-bromopropyloxy）-4＇- （4-alkyloxybenzylidene）anilines in which the phenyl ring is armed by a bromopropyloxy chain.The thermal behavior and mesomorphic properties of the synthesized compounds were studied with particular attention given to the correlation between their phase transition temperatures and anisotropic change influenced by molecular structure.All the members displayed enantiotropic smectic phase except for the homologue with the longest alkyloxy chain（R = C_（18）H_（37））,exhibiting only monotropic characteristic. The presence of bromine atom from the propyloxy side chain is found to be capable of altering and influencing the mesomorphic properties.This article describes the preparation and liquid crystalline properties of a new homologous series of 4-（4-bromopropyloxy）-4＇- （4-alkyloxybenzylidene）anilines in which the phenyl ring is armed by a bromopropyloxy chain.The thermal behavior and mesomorphic properties of the synthesized compounds were studied with particular attention given to the correlation between their phase transition temperatures and anisotropic change influenced by molecular structure.All the members displayed enantiotropic smectic phase except for the homologue with the longest alkyloxy chain（R = C_（18）H_（37））,exhibiting only monotropic characteristic. The presence of bromine atom from the propyloxy side chain is found to be capable of altering and influencing the mesomorphic properties.

关 键 词：4-（4-Bromopropyloxy）-4＇-（4-alkyloxybenzylidene）anilines Mesomorphic properties Enantiotropic smectic DSC 

分 类 号：O753.2[理学—晶体学]