Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent  

作　　者：Sie Tiong Ha Teck Leong Lee Siew Ling Lee Guan Yeow Yeap Yip Foo Win Siew Teng Ong 

机构地区：[1]Department of Chemical Science,Faculty of Science,Universiti Tunku Abdul Rahman,Jln Universiti,Bandar Barat,31900 Kampar,Malaysia [2]Ibnu Sina Institute for Fundamental Science Studies,Universiti Teknologi Malaysia,81310 UTM Skudai,Malaysia [3]Liquid Crystal Research Laboratory,School of Chemical Sciences,Universiti Sains Malaysia,11800 Minden,Malaysia [4]Department.of Chemical Science,Faculty of Science,Universiti Tunku Abdul Rahman,Jln Universiti,Bandar Barat,31900 Kampar,Malaysia

出　　处：《Chinese Chemical Letters》2012年第2期177-180,共4页中国化学快报（英文版）

基　　金：Universiti Tunku Abdul Rahman and Malaysia Ministry of Higher Education for the financial supports via LRGS and research facilities

摘　　要：A homologous series of azomethine esters,4-n-alkanoyloxybenzylidene-4＇-bromoanilines possessing even number of carbon atoms at the terminal alkanoyloxy chain（C_（n-1）H_（2n-1）COO- n = 8,10,12,14,16,18） was synthesized and characterized.Whilst n-octanoyloxy to n-dodecanoyloxy derivatives exhibited enantiotropic smectic A and smectic B phases,n-tetradecanoyloxy to n-octadecanoyloxy derivatives possessed enantiotropic smectic A and monotropic smectic B properties.n-Decanoyloxy derivatives demonstrated the optimum exhibition for both smectic A and smectic B phases.It was found that the length of terminal alkanoyloxy chain has an influence on mesomorphic properties.A homologous series of azomethine esters,4-n-alkanoyloxybenzylidene-4＇-bromoanilines possessing even number of carbon atoms at the terminal alkanoyloxy chain（C_（n-1）H_（2n-1）COO- n = 8,10,12,14,16,18） was synthesized and characterized.Whilst n-octanoyloxy to n-dodecanoyloxy derivatives exhibited enantiotropic smectic A and smectic B phases,n-tetradecanoyloxy to n-octadecanoyloxy derivatives possessed enantiotropic smectic A and monotropic smectic B properties.n-Decanoyloxy derivatives demonstrated the optimum exhibition for both smectic A and smectic B phases.It was found that the length of terminal alkanoyloxy chain has an influence on mesomorphic properties.

关 键 词：Liquid crystals Schiff base ester Enantiotropic Smectic A Smectic B 

分 类 号：O753.2[理学—晶体学] TN929.5[电子电信—通信与信息系统]