New classes of thiadiazole and oxadiazole compounds for use in LC mixtures are disclosed. In an embodiment, the new classes of thiadiazoles and oxadiazoles comprise at least one phenyl ring attached to the heterocyclic ring, where no alkyl, alkenyl or alkynyl tails are attached to the phenyl ring, but one alkyl, alkenyl or alkynyl tail is attached to the other end of the molecule, and a fluoro or cyano group appears in the para position of the phenyl ring. These compounds are disclosed as being effective at inducing smectic A phases in liquid crystal mixtures, particularly in liquid crystal mixtures also possessing a smectic C phase, more particularly in materials possessing a chiral smectic C (ferroelectric) phase.
本发明公开了用于低浓度混合物的新型
噻二唑和噁二唑化合物。在一个实施方案中,新类别的
噻二唑和噁二唑包括至少一个连接到杂环上的苯基环,其中苯基环上没有连接烷基、烯基或炔基尾部,但分子的另一端连接了一个烷基、烯基或炔基尾部,苯基环的对位出现了一个
氟或
氰基。这些化合物可以有效地诱导液晶混合物中的 Smectic A 相,特别是在同时具有 Smectic C 相的液晶混合物中,尤其是在具有手性 Smectic C(
铁电)相的材料中。