A 2,5-disubstituted pyrizine derivative and a 2,5-disubstituted pyrimidine derivative of the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each independently represents a straight-chain or branched alkyl group containing 1 to 20 carbon atoms; X represents a halogen atom; and ##STR2## represents a pyrazine-2,5-diyl or a pyrimidine-2,5-diyl group; each useful as an electrooptical display material are disclosed. Further a liquid crystal composition comprising said compounds as well as a ferroelectric display device wherein said liquid crystal composition is used are disclosed.
公开了式(I)的2,5-二取代
吡啶衍生物和2,5-二取代
嘧啶衍
生物:##STR1## 其中R.sup.1和R.sup.2各自独立地表示含有1至20个碳原子的直链或支链烷基;X表示卤素原子;以及##STR2##表示
吡嗪-2,5-二基或
嘧啶-2,5-二基基团。这些化合物均可用作电光显示材料。此外还公开了包含所述化合物的液晶组分以及使用所述液晶组分的
铁电显示装置。