polarizing optical microscopy (POM) attached with a hot stage. Most of the compounds are thermotropic liquid crystals. Different phases such as smectic, (SmC, SmA) and nematic (N) were shown by crown ether Schiff bases containing azomethine and hydroxy group which are characteristic of rodlike liquid crystals.
不同的
冠醚席夫碱是通过将不同的醛与反式二
氨基二苯并 18-crown-6 缩合而制备的。这些化合物的物理性质和
化学配方来自微量分析和光谱方法。相变温度和热参数由差示扫描量热法 (
DSC) 获得。在带有热台的偏光光学显微镜(POM)下进行纹理观察。大多数化合物是热致液晶。不同的相如近晶相、(SmC、SmA) 和向列相 (N) 由含有偶氮甲碱和羟基的
冠醚席夫碱显示,这是棒状液晶的特征。