We report the synthesis and characterization of two series of novel triphenyleneâanthraquinone-based symmetric discotic liquid crystalline trimers. These triads were prepared using microwave dielectric heating. Conventional heating under similar reaction conditions failed to produce desired products. To the best of our knowledge, these are the first donorâacceptorâdonor triads in which all the three components represent discotic mesogenic moieties. Chemical structures of these discotic oligomers have been characterized by spectral techniques and elemental analysis. The thermotropic liquid crystalline properties of these donorâacceptorâdonor triads were investigated by polarizing optical microscopy and differential scanning calorimetry. They exhibit a columnar mesophase over a wide range of temperature. The columnar hexagonal mesophase structure of these discotic oligomers has been elucidated with the help of X-ray diffraction studies.
我们报告了两系列新型三
萘烯-
蒽醌基对称盘状
液晶三聚体的合成与表征。这些三聚体是通过微波介电加热制备的。在类似反应条件下,常规加热未能产生预期的产物。据我们所知,这是首个所有三种组分均为盘状
中间体的给体-受体-给体三聚体。这些盘状 oligomers 的
化学结构已通过光谱技术和元素分析进行了表征。这些给体-受体-给体三聚体的热致
液晶性质通过偏光显微镜和差示扫描量热法进行了研究。它们在广泛的温度范围内展现出柱状中相。借助 X 射线衍射研究,我们阐明了这些盘状 oligomers 的柱状六角中相结构。