A novel liquid crystalline compound having a low viscosity and a high elastic constant ratio and at the same time, a superior compatibility with other known liquid crystalline compounds and a liquid crystal composition and a liquid crystal display element using are provided.
The compound is an alkenylcyclohexane derivative expressed by the formula (1):
wherein R1 and R2 represent a linear or branched alkyl group of 1 to 15 carbon atoms or alkenyl group of 2 to 15 carbon atoms; at least one of R1 and R2 represents an alkenyl group; in these groups, one or not-adjacent one or more CH2 groups may be replaced by oxygen atom, sulfur atom or -C≡ C- group; ring A1 , ring A2 and ring A3 each independently represent 1,4-cyclohexylene group wherein one or more CH2 groups on the ring may be replaced by oxygen atom or sulfur atom, or 1,4-phenylene group wherein one or more CH groups on the ring may be replaced by nitrogen atom; Z1 and Z2 each independently represent -CH2 CH2 -, -CH2 O-, -OCH2-, -CH=CH-, -C ≡ C- or single bond; Z3 represents -(CH2)4-, -CH=CH-(CH2)2-, -CH2-CH=CH-CH2- or -(CH2)2 -CH=CH-; and m, n and i each independently represent 0 or 1.
本研究提供了一种新型液晶化合物,该化合物具有低粘度和高弹性常数比,同时与其他已知液晶化合物具有良好的兼容性,并提供了一种液晶组合物和一种液晶显示元件。
该化合物是一种烯基
环己烷衍
生物,用式(1)表示:
其中 R1 和 R2 代表 1 至 15 个碳原子的直链或支链烷基或 2 至 15 个碳原子的烯基;R1 和 R2 中至少有一个代表烯基;在这些基团中,一个或不相邻的一个或多个
CH2 基团可以被氧原子、
硫原子或-C≡C-基团取代;环 A1、环 A2 和环 A3 各自独立地代表 1,4-
环己烯基团,其中环上的一个或多个 基团可被氧原子或
硫原子取代,或代表 1,4-亚苯基基团,其中环上的一个或多个 CH 基团可被氮原子取代;Z1 和 Z2 各自独立地代表- -、- O-、-O -、-CH=CH-、-C ≡ C-或单键;Z3 代表-( )4-、-CH=CH-( )2-、- -CH=CH- -或-( )2 -CH=CH-;以及 m、n 和 i 各自独立地代表 0 或 1。