A 2,5-disubstituted pyrazine derivaitve and a 2,5-disubstituted pyrimidine derivative of the formula (I):
wherein R¹ and R² each independently represents a straight chain or branched alkyl group containing 1 to 20 carbon atoms;
X represents a halogen atom; and
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.
式(I)的 2,5-二取代
吡嗪衍
生物和 2,5-二取代
嘧啶衍
生物:
其中 R¹ 和 R² 各自独立地代表含有 1 至 20 个碳原子的直链或支链烷基;
X 代表卤素原子;和
代表
吡嗪-2,5-二基或
嘧啶-2,5-二基;
公开了每种可用作电光显示材料的物质。此外,还公开了包含上述化合物的液晶组合物以及使用上述液晶组合物的
铁电显示装置。