摘要
以对羟基苯甲醛和一系列4-正丙基、4-正戊基取代的双环己基甲酸、联苯甲酸及环己基苯甲酸为主要原料,通过室温氯化、酯化等方法合成了4个C3和C5烷基取代的多环单酯基苯甲醛类液晶:4-(4-(反-4-丙基环己基)苯酰氧)苯甲醛、4-(反-4-(反-4-丙基环己基)环己酰氧)苯甲醛、4-(反-4-(反-4-正戊基环己基)环己酰氧)苯甲醛和4-(4-(4-正戊基苯)苯酰氧)苯甲醛。用元素分析1、H NMR、IR及MS测试技术表征了产物结构,通过DSC及POM(偏光显微镜)对其液晶相进行了研究。结果表明,在室温条件下的羧酸氯化可有效地抑制反式环己烷的构型转化;这类化合物具有热致液晶性,呈典型的向列相纹影及条纹织构,液晶相温度区间为107～156℃。
With a series of carboxylic acids of double rings substituted by n-propyl, n-pentyl with p-hydroxyl benzaldehyde as reactants, four liquid crystal compounds of multi-ring monoesteryl aryl aldehydes were synthesized by the reactions of chloridating and esterifying at room temperature. They were 4-（4-（trans-4-propylcyclohexyl） benzoyloxy） benzaldehyde, 4-（ trans-4-（ trans-4-propcyclohexyl ） cyclohexacyloxy ） benzaldehyde, 4-（ 4-（ trans-4- pentylcyclohexyl） cyclohexacyloxy ） benzaldehyde, and 4-（ 4-（ 4-pentylphenyl ） benzoyloxy ） benzaldehyde. Their structures were identified by IR, MS, ^1H NMR and elemental analysis. DSC measurement showed their mesophase. POM（polarizing optical microscope） revealed their obvious nematic schlieren and streak textures. The results show that chloridating of carboxylic acid at room temperature can inhibit the configuration transforming of trans-cyclohexane and the temperature range of phase transition for the resulting compounds is 107 - 156℃.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第4期396-400,共5页
Chinese Journal of Applied Chemistry
基金
国防科工委关键基础材料研究项目(K0900050802)
关键词
芳香醛
酯基
液晶
织构
aryl aldehyde, esteryl, liquid crystal, texture
