一类联苯酯二聚体分子的合成及液晶性能  

Synthesis and Liquid Crystal Properties of a Class of Biphenyl Ester Dimers

作　　者：苏怡霖 袁金虎 杨忠臣 刘永亮 朱生勃 SU Yilin;YUAN Jinhu;YANG Zhongchen;LIU Yongliang;ZHU Shengbo(Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices,School of Materials Science and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学陕西省光电功能材料与器件重点实验室/材料与化工学院,西安710021

出　　处：《西安工业大学学报》2023年第5期478-483,共6页Journal of Xi’an Technological University

基　　金：国家自然科学基金青年项目(61704133)。

摘　　要：为进一步探索二聚体分子的合成和液晶性能,文中以4′丁氧基联苯4羧酸和4′己氧基联苯4羧酸为起始化合物,分别与1,6二溴己烷发生酯化反应,以无水碳酸钾(K_(2)CO_(3))为催化剂、N,N二甲基甲酰胺(DMF)为溶剂,在80℃下反应6 h,合成了一类联苯酯类二聚体分子,并对其分子结构和液晶性能进行了表征与测试。研究结果表明:目标化合物C_(40)H_(46)O_(6)分子中的46个氢原子和C_(44)H_(54)O_(6)分子中的54个氢原子均被一一归属,其中产物C_(40)H_(46)O_(6)在升温至146.44℃时出现明显的吸热峰,从羽毛状的固态直接转变为清亮的液态;而在降温至140.60℃时,呈现出液滴状纹影织构。结论可为更复杂二聚体分子的液晶行为提供参考。The study aims to further explore the synthesis and liquid crystal properties of dimer molecules.First,4'butoxybipheny l 4 carboxylic acid and 4'hexyloxybiphenyl 4 carboxylic acid which were used as the starting compounds were esterified with 1,6 dibromohexane,respectively.And then with anhydrous potassium carbonate(K_(2)CO_(3))as the catalyst and N,N dimethylformamide(DMF)as the solvent,after 6 hours of reaction at 80℃,a class of biphenyl ester dimers molecules were synthesized.Finally,their molecular structures and liquid crystal properties were characterized and tested.The results show that 46 hydrogen atoms in the target compound C_(40)H_(46)O_(6)molecule and 54 hydrogen atoms in the C_(44)H_(54)O_(6)molecule were attributed one by one.The product C_(40)H_(46)O_(6)showed an obvious heat absorption peak when the temperature rose to 146.44℃,changing directly from a feathery solid to a clear liquid;when the temperature dropped to 140.60℃,it showed a droplet like striated shadow weave structure.These results can provide reference for the understanding of the liquid crystal behavior of more complex dimer molecules.

关 键 词：酯化反应 液晶二聚体 向列相 热致液晶 

分 类 号：TQ317[化学工程—高聚物工业] O753.2[理学—晶体学]