The invention lies particularly in novel compounds represented by the general formula;
in which Z means CF₃ CHF₂ CH₂F, CClF₂ CCl₂F, CHClF, CCl₃ C₂F₂ or a perfluoroalkyl group of 3 or more carbon atoms, m and n are same or different with each other and represent an integral of 1 - 20, which are ferroelectric and chiral smectic liquid crystals of a large spontaneous polarization, a high speed of response and a good orientation, and showing a liquid crystal phase of tristable state and an electoclinic effect to be used as an liquid crystal element superior in an image display response.
本发明尤其涉及由通式表示的新型化合物;
其中 Z 指 CF₃ CHF₂ CH₂F、CClF₂ CCl₂F、CHClF、CCl₃ C₂F₂或 3 个或 3 个以上碳原子的
全氟烷基,m 和 n 彼此相同或不同,并代表 1 - 20 的整数、它们是自发极化大、响应速度快、取向性好的
铁电和手性 Smectic 液晶,显示出三稳态液晶相和电晶效应,可用作图像显示响应性能优越的液晶元件。