The invention provides a liquid crystal compound having general physical properties necessary for the compound, namely stability to heat, light and so forth, a wide temperature range of a liquid crystal phase, a high clearing point, a good compatibility with other compounds, a large optical anisotropy and a large dielectric anisotropy; a compound represented by formula (1):
wherein, for example, R1 is alkyl having 1 to 20 carbons; ring A1 and ring A4 each are 1,4-cyclohexylene, 1,4-phenylene, or 1,4-phenylene in which arbitrary hydrogen is replaced by halogen; Z1 and Z4 each are a single bond; L1, L2, L3 and L4 each are hydrogen or fluorine; and X1 is fluorine, chlorine, —CF3 or —OCF3.
本发明提供了一种液晶化合物,具有化合物所需的一般物理性质,即对热、光等的稳定性,液晶相的广泛温度范围,高清晰点,与其他化合物的良好相容性,大光学各向异性和大电介质各向异性;化合物的表示式(1):其中,例如,R1是具有1至20个碳的烷基;环A1和环A4各为1,4-环己基,1,4-苯基,或1,4-苯基,其中任意氢原子被卤素取代;Z1和Z4各为单键;L1、
L2、L3和L4各为氢或
氟;X1为
氟、
氯、-
CF3或-O 。