液晶研究（Ⅰ）──4＇－酰基－4－羟基－1，1＇－联苯酯类液晶的合成与性质  

Liquid Crystallines Study(Ⅰ)──Synthesis and Properties of 4'-Acyl-4-biphenylol Esters

作　　者：陆婉芳[1] 张智勇[1] 施耀曾[1] 

机构地区：[1]南京大学化学系,清华大学化学系

出　　处：《高等学校化学学报》1995年第5期719-724,共6页Chemical Journal of Chinese Universities

基　　金：江苏省科委;国家自然科学基金

摘　　要：以４＇－羟基联苯为原料合成了８种新型４＇－酰基－４－羟基联苯酯类化合物．除化合物５＿ｈ外，均为新的近晶相液晶化合物．它们具有较宽的相变温度范围和较高的热稳定性．用偏光显微镜和差热分析仪研究了它们的相行为，讨论了分子结构对液晶相行为的影响．Biphenyl esters are useful and important materials for liquid crystal dispiays. Re cently it is well known that the presence of an acyl terminal group which atteched with its carbonyl carbon atom directly to an aromatic core,in liquid crystalline compounds would usually increase both the molecular rigidity and polarity, and as a result, the compounds could show some better mesomorphic properties than those that contain the same molecular backbone but carry only R- or RO- terminal chains.Thus, we synthesized eight new 4' -acyl-4-biphenylol esters 5a-h with 4-biphenylol as starting material to study the effect of molecular structure on phase behavior of these esters. Chemical structures of these com pounds were determined by IR, 1H NMR, MS and elementary anaiysis. Their liquid crystal properties were tested by hot stage polarizing microscopy and differential scanning calorime try. Except compound 5h, these compounds have a wide tempetature range of mesophase and high thermostability. Some of them show a monotropic phase transition in the Sc phase. The SA-Sc phase transition of compound 5c is a second type phase transition. Compound 5g,though there is no chiral carbon in the molecule , displays a stripped focal conic texture in the Sc phase.The effect of molecular structure on liquid crystal properties was discussed.

关 键 词：酰基 羟基联苯酯 液晶 近晶相 合成 性质 

分 类 号：O753.2[理学—晶体学] O625.323