To provide a novel 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 refractive index anisotropy, a large dielectric anisotropy and a small viscosity. The liquid crystal compound is provided as compound (1):
wherein, for example, R1 is alkyl having 1 to 20 carbons; ring A1 and ring B1 are 1,4-cyclohexylene or 1,4-phenylene; Z1 and Z2 are a single bond, —CH2CH2—, —CH═CH— or —C≡C—; L1 is fluorine; L2, Y1 and Y2 are hydrogen, fluorine or chlorine; and X1 is halogen, —C≡N or alkyl having 1 to 10 carbons, and in the alkyl, arbitrary —CH2— may be replaced by —O— or —S—, and m is 1 and n is 0.
为提供一种新型液晶化合物,具有化合物所需的一般物理特性,即热稳定性、光稳定性等,液晶相的宽温度范围、高清晰点、与其他化合物良好的相容性、大折射率各向异性、大介电各向异性和小粘度。所提供的液晶化合物为化合物(1):其中,例如,R1是具有1至20个碳原子的烷基;环A1和环B1是1,4-环己基或1,4-苯基;Z1和Z2是单键,- -,-CH═CH-或-C≡C-;L1是
氟;
L2、Y1和Y2是氢、
氟或
氯;X1是卤素,-C≡N或具有1至10个碳原子的烷基,在烷基中,任意-
CH2-可以被- O-或-S-所替代,m为1,n为0。