4-羧酸正己酯基-4'-正己氧基偶氮苯液晶的合成与表征  

Synthesis and Characterization of 4-( n-hexyl carboxylate)-4'-( n-hexyloxy) azobenzene Liquid Crystal

作　　者：刘坤[1] 赵常礼[1] 王丹[1] 张曦[1] 

机构地区：[1]沈阳化工大学辽宁省高校高分子材料应用技术重点实验室,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2016年第1期27-32,共6页Journal of Shenyang University of Chemical Technology

基　　金：辽宁省教育厅高等学校科研项目(20060681)

摘　　要：以4-羧基-4'-羟基偶氮苯为偶氮苯化合物母体,与n-溴己烷发生酯化和醚化反应,制得4-羧酸正己酯基-4'-正己氧基偶氮苯液晶.利用红外光谱、核磁共振氢谱以及紫外可见光谱分析产物的结构,并研究其在乙醇溶液中的光异构化反应,采用差示扫描量热(DSC)和偏光显微镜(POM)表征其液晶性.结果表明:在紫外光照射下,该液晶分子会发生顺反结构的光异构化反应;同时发现该化合物为双向热致液晶,且表现出近晶态液晶织构.A novel azobenzene liquid crystal 4- （ n-hexylcarboxylate ） -4＇- （ n-hexyloxy ） azobenzene was synthesized by esterification and etherification reaction between 4-carboxy-4＇-hydroxy azobenzene and n-bromohexane. The structure of the compound was characterized by PT-IR and 1H-NMR. The changes in UV-Vis spectra of 4- （n-hexylcarboxylate） - 4＇- （ n-hexyloxy ） azobenzene irradiated by lights were investi- gated. Liquid crystalline properties were detected with differential scanning calorimetry （DSC） and polari- zing optical microscope （ POM ）. The results showed that 4- （ n-hexylcarboxylate ） - 4＇- （ n-hexyloxy ） azo- benzene undergoes trans--,cis isomerization irradiated by 360 nm UV light and cis--,trans isomerization ir- radiated by 440 nm visible light subsequently. At the same time, this compound was found to be a bidirec- tional thermotropic liquid crystal, showing smectic textures.

关 键 词：偶氮苯 溴己烷 光异构化 液晶 

分 类 号：O623.626[理学—有机化学]