| abstract |
(57) [Problem] To provide a pyridinium-type ionic compound derivative which is useful as a thermotropic liquid crystal substance exhibiting liquid crystallinity of a smectic A phase or a chiral smectic phase. SOLUTION: The following general formula (I) or (XI): (Wherein, R 1 and R 2 are the same or different alkyl groups having 1 to 22 carbon atoms, R 4 is an optically active group, and X represents a halogen atom). Pyridinium-type ionic compound derivatives. |