Novel liquid crystal compounds having a positive dielectric anisotropy and liquid crystal compositions containing the same are provided, which liquid crystal compounds are 2,3-dicyano-5-substituted pyrazines expressed by the general formula
wherein n represents 0 or 1; X represents R,
or
or
in the case of n = 1; and R represents a linear chain alkyl group or an alkoxy group, each of 1 to 10 carbon atoms, and which in liquid crystal compositions, when sealed in a TN cell, make it possible to operate the cell under a low threshold voltage and in a small consumption of electric power.
本发明提供了具有正介电常数各向异性的新型液晶化合物以及含有这些化合物的液晶组合物,这些液晶化合物是由通式表示的 2,3-二
氰基-5-取代
吡嗪,其中 n 代表 0 或 1;X 代表 R,或或在 n = 1 的情况下;R 代表直链烷基或烷氧基,每个烷氧基有 1 至 10 个碳原子,在液晶组合物中,当密封在 TN 电池中时,可使电池在低阈值电压下工作,且耗电量小。