2-phenyl-5-(4'-trans-cyclohexyl) phenyl pyrimidine derivatives represented by the general formula: ##STR1## wherein R is a straight chain alkyl group having 1 to 10 carbon atoms; X is CN or F; Y is F or H; Z is F or H; and when X is F, at least one of Y and Z is H; and the cyclohexane ring is a trans isomer, exhibiting a nematic phase and having a high nematic phase-isotropic liquid phase transition temperature (N-I Point) and large positive dielectric constant anisotropy (.DELTA..epsilon.). The pyrimidine derivatives may be included in liquid crystal compositions for improved display devices having a wide temperature range, including a high N-I point, a low threshold voltage and a low driving voltage.
一般式表示的2-苯基-5-(4'-反式环己基)
苯基嘧啶衍
生物:其中R为具有1至10个碳原子的直链烷基基团;X为CN或F;Y为F或H;Z为F或H;当X为F时,至少有一个是H;
环己烷环为反异构体,表现出向列相和具有高向列相-各向同性液相转变温度(N-I点)和大正介电常数各向异性(Δε)的特性。这些
嘧啶衍
生物可以包含在液晶组合物中,用于改进具有广泛温度范围的显示器件,包括高N-I点、低阈值电压和低驱动电压。