Abstract

Novel hydrogen bond liquid crystal homologous series derived from alkyloxy benzoic acids and α-ketoglutaric acid are isolated and experimented. This homologous series referred as KGA + nBAO comprises of eight mesogens in which the alkyloxy benzoic acid varied from pentyloxy to dodecyloxy. Fourier Transform Infrared Spectroscopy analysis confirmed the formation of hydrogen bond. Optical polarizing microscopy reveals that this homologous series exhibits three phases namely nematic, smectic C and smectic G. The transition temperatures obtained by Differential Scanning Calorimetry and optical microscopy and corresponding enthalpy values are tabulated for all the homologues of the series and various thermal parameters are derived.

摘要

分离并实验了衍生自烷氧基苯甲酸和α-酮戊二酸的新型氢键液晶同系物。这个被称为 KGA + nBAO 的同系物包含八个介晶，其中烷氧基苯甲酸从戊氧基到十二烷氧基不等。傅里叶变换红外光谱分析证实了氢键的形成。光学偏光显微镜显示该同系物具有三个相，即向列相、近晶相 C 和近晶相 G。通过差示扫描量热法和光学显微镜获得的转变温度和相应的焓值被制成表格，用于该系列的所有同系物，并推导出各种热参数.