中文摘要：

合成和表征了新型的含有甲氧基偶氮苯液晶基元的3，4，5-三取代苯甲酸衍生物Dn，研究了结构对其相行为的影响．结果表明，在Dn中，羰基（C=O）和羟基（OH）之间的氢键相互作用存在于结晶态、液晶态和各向同性状态，在各向同性态时氢键较弱．通过对其分子结构的调控，有效地抑制了做相分离和强的分子间的相互作用，得到了具有单向向列型液晶行为的3，4，5-三取代的苯甲酸衍生物。

英文摘要：

A novel type of H-bonded liquid crystals, namely 3,4,5- { 4-[ （4-methoxy-phenyl） -azo ] -phenoxyt -alkoxy-benzoic acid（Dn, n = 3,6,10） , was synthesized and characterized. The FT IR spectra of D10 in the range of 1 670-1 650 cm^-1 at different temperatures were examined. The results show that the carboxyl acid groups in D 10 are associated to form intermolecular double hydrogen bonding between -C = O and -OH groups in crystalline up to the isotropic phase. The tained through molecular design by preventing effectively. benzoic acid derivatives exhibiting nematic phase were obsegregation and modulating intermolecular interactions