【作者】 胡昆； 王盛霖； 安福田； 王倩； 王星； 陈沛； 安忠维； 陈新兵；

【Author】 Kun Hu;Shenglin Wang;Futian An;Qian Wang;Xing Wang;Pei Chen;Zhongwei An;Xinbing Chen;Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, Shaanxi Normal University;College of Materials Science and Engineering, Shaanxi Normal University;

【机构】 应用表面与胶体化学教育部重点实验室,陕西师范大学； 材料科学与工程学院陕西师范大学；

【摘要】 苯并噁唑类衍生物在分子荧光探针、有机配合物、生物医药及液晶[1]等领域有重要的应用价值,近年来备受研究者的关注。苯并噁唑类液晶是一类强诱电性液晶材料[2],具有良好的应用前景,但其结构与液晶性能的关系有待进一步的研究。为此本文设计并制备了以苯、联苯及含氟联苯作为致晶单元的系列苯并噁唑端基类液晶化合物,研究了侧氟取代基、末端取代基的极性、柔性烷氧基链的长短对其液晶性能和光学性能等的影响规律。结果表明:致晶单元的加长有利于拓宽液晶相区间,侧向氟原子的引入能够有效的降低液晶的熔点和清亮点;不同极性的末端取代基表现出不同的紫外吸收和荧光发射。含侧氟联苯致晶单元的苯并噁唑端基类液晶化合物具有低熔点、宽向列相、热稳定性好等优良的液晶性能,有望应用于液晶显示器。更多还原

【Abstract】 Benzoxazole derivatives attract many attentions in recent years, because they can be widely used in molecular probe, organic saccharide-metal complex, biological medicine and liquid crystal. For better understanding of the structure–property relationships, series of benzoxazole derivatives bearing different substituents, crystal cells, alkyloxy chains were prepared and characterized. The results showed that: it was obvious that extended π-conjugated molecules displayed wide mesophase range but high melting point. After the introduction of fluoro substituents, the resulting compounds exhibited lower melting points. It was noted that these laterally fluorinated liquid crystals exhibited a wide nematic mesophase, indicating potential application in liquid crystal display mixtures.更多还原