A novel pyridine derivative capable of increasing the dielectric anisotropy value (.DELTA..epsilon.) or optical anisotropy value (.DELTA.n) of liquid crystal compositions including the derivative and lowering the driving voltages of liquid crystal display elements using the composition, and also a liquid crystal composition containing the pyridine derivative are provided, which pyridine derivative is expressed by the formula R--X--COO--Y--CH.sub.2 CH.sub.2 --Z--A wherein R represents an alkyl group or an alkoxy group each of 1-10 carbon atoms; X represents ##STR1## Y represents ##STR2## when Y is ##STR3## Z represents ##STR4## and A represents F, Cl or cyano group; and when Y is ##STR5## Z represents ##STR6## and A represents an alkyl group or an alkoxy group each of 1-10 carbon atoms.
提供一种新的
吡啶衍生物,能够增加包含该衍
生物的液晶组分的介电各向异性值(Δε)或光学各向异性值(Δn),并降低使用该组分的液晶显示元件的驱动电压,以及含有该
吡啶衍生物的液晶组分。该
吡啶衍生物由以下公式表示:R--X--COO--Y--CH.sub.2 CH.sub.2 --Z--A,其中R表示1-10个碳原子的烷基或烷氧基;X表示##STR1##;Y表示##STR2##,当Y为##STR3##时,Z表示##STR4##,A表示F、Cl或
氰基;当Y为##STR5##时,Z表示##STR6##,A表示1-10个碳原子的烷基或烷氧基。