Synthesis and mesomorphic evaluation of new calamitic liquid crystals containing benzothiazole core  

作　　者：Teck Ming Koh Sie Tiong Ha Teck Leong Lee Siew Ling Lee Guan Yeow Yeap Hong Cheu Lin Ramesh T.Subramaniam 

机构地区：[1]Department of Science,Faculty of Engineering & Science,Universiti Tunku Abdul Rahman,Jln Genting Klang,Setapak,53300 Kuala Lumpur.Malaysia [2]Department of Chemistry,National University of Singapore,Singapore 117543,Singapore [3]Department of Chemical Science,Faculty of Science,Universiti Tunku Abdul Rahman,Jln Universiti,Bandar Barat,31900 Kampar,Perak,Malaysia [4]Ibnu Sina Institute for Fundamental Science Studies,Universiti Teknologi Malaysia,81310 UTM Skudai,Johor,Malaysia [5]Liquid Crystal Research Laboratory,School of Chemical Sciences,Universiti Sains Malaysia,11800 Minden,Penang,Malaysia [6]Department of Materials Science & Engineering,National Chiao Tung University,Hsinchu 300,Taiwan [7]Center for Ionics University Malaya [8]Department of Physics,Faculty of Science,University of Malaya,50603 Kuala Lumpur,Malaysia

出　　处：《Chinese Chemical Letters》2011年第5期619-622,共4页中国化学快报（英文版）

基　　金：Universiti Tunku Abdul Rahman(UTAR) for the UTAR Research Fund (No.6200/H02);the Malaysia Toray Science Foundation(No.4359/000) for funding this project

摘　　要：The design and synthesis of new calamitic benzothiazole-based liquid crystals,2-[4-（4-alkyloxybenzoyloxy）-phenyl]ben-zothiazoles are presented.The target compound was characterized using spectroscopic techniques,such as FT-IR,NMR（~1H and ^（13）C）,microanalysis and EI-MS.The liquid crystalline behaviours of these compounds were thoroughly examined by differential scanning calorimetry and polarizing optical microscope techniques.These materials exhibited enantiotropic nematic phase with high thermal stability（168℃）.Smectic A phase starts to emerge as monotropic（metastable） phase from C10 member and changes into enantiotropic（stable） phase from C12 and persists up to C16 members.The design and synthesis of new calamitic benzothiazole-based liquid crystals,2-[4-（4-alkyloxybenzoyloxy）-phenyl]ben-zothiazoles are presented.The target compound was characterized using spectroscopic techniques,such as FT-IR,NMR（~1H and ^（13）C）,microanalysis and EI-MS.The liquid crystalline behaviours of these compounds were thoroughly examined by differential scanning calorimetry and polarizing optical microscope techniques.These materials exhibited enantiotropic nematic phase with high thermal stability（168℃）.Smectic A phase starts to emerge as monotropic（metastable） phase from C10 member and changes into enantiotropic（stable） phase from C12 and persists up to C16 members.

关 键 词：BENZOTHIAZOLE Alkoxy chain NEMATIC Smectic A Liquid crystal 

分 类 号：O753.2[理学—晶体学]