新型对称联苯双酯类液晶材料的合成和晶体结构  

Synthesis and Crystal Structure of Novel Symmetrical Diphenylnate Liquid Crystal

作　　者：陈卫东[1] 刘勇[1] 张鹏云 张有明[1] 魏太保[1] 

机构地区：[1]西北师范大学化学化工学院生态环境相关高分子材料教育部重点实验室,兰州730070 [2]甘肃省化工研究院,兰州730020

出　　处：《有机化学》2011年第5期677-683,共7页Chinese Journal of Organic Chemistry

基　　金：甘肃省科技厅"科技支撑计划"(No.0804GKCA019);国家自然科学基金(No.20371040);教育部科学技术研究重点(No.205161);甘肃省中青年科学基金(No.3YS051-A25-010)资助项目

摘　　要：设计并合成了4个对称联苯双酯类液晶化合物,化合物结构通过红外和核磁表征,它们的介晶性通过差示扫描量热仪(DSC),X射线衍射仪(XRD)和热台偏光显微镜(POM)进行了研究.并测定了4,4′-3,3′,5,5′-四甲基联苯-二(4-巴基苯甲酸酯)(Ⅲa)的单晶结构,结果显示:晶体属于单斜晶系,P21/c空间群,晶胞参数为a=18.525(3),6=12.196(2),c=12.195(2)(?),β=97.142(2)°,V=2733.7(9)(?)3,Z=4,Dc=1.163 Mg/m3,R=0.0521,Rw=0.1161.化合物均为热致型互变液晶,并讨论了氧原子、不饱和端基和端基链长对介晶性的影响.Four symmetrical diphenylnate liquid crystals were prepared and their structures were confirmedby FT-IR and 1H NMR spectra. Their liquid crystal properties were tested by differential scanning calo-rimetry （DSC）, X-ray diffraction （XRD） and hot stage polarizing microscop （POM）. The crystal structure ofⅢa was detemflned by X-ray single crystal diffraction techniques. Ⅲa is a monoclinic crystal system,space group P21/c with the unit cell parameters： a=18.525（3） （？）, b=12.196（2） （？）, c=12.195（2） （？）,β=97.142（2）°, V=2733.7（9） （？）3, Z=4, Dc=1.163 Mg/m3, R=0.0521, Rw=0.1161. The results showed thatmolecules lead thermotropic liquid crystals properties. The relations among the mesomorphism, oxygen at-oms, terminal unsaturated bond, the flexible chain length were investigated.

关 键 词：联苯双酯液晶 织构 热致型液晶 晶体结构 

分 类 号：O621.3[理学—有机化学]