A novel liquid crystalline, halogen-containing heterocyclic compound having a characteristic that even when its S.sub.c * phase is supercooled, no other smectic phases appear, and a liquid crystal composition containing the same are provided, which compound is expressed by the formula ##STR1## wherein R.sub.1 and R.sub.2 each represent an alkyl group of 2 to 18 carbon atoms; X represents --N.dbd. or --CH.dbd.; Y represents F or Cl; n represents an integer of 0 to 10; and a symbol * represents an asymmetric carbon atom.
提供一种新的液晶相、含卤素的
杂环化合物,其具有特点,即使其S.sub.c*相被超冷,也不会出现其他的smectic相,以及包含该化合物的液晶组合物。该化合物由以下式子表示:##STR1##其中,R.sub.1和R.sub.2分别表示2至18个碳原子的烷基;X表示--N.dbd.或--CH.dbd.;Y表示F或Cl;n表示0至10的整数;符号*表示不对称碳原子。