| abstract |
A mesomorphic compound represented by the following formula (I):n wherein R 1 and R 2 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of including one or two or more non-neighboring methylene groups which can be replaced with -O-, -S-,n -CH = CH-, -C≡C- orn wherein X denotes halogen; X 1 and X 2 respectively denoten Z, denotesn or -CH 2 0-; A 1 denotes a single bond,n n and Y 1 and Y 2 respectively denote H, F, Cl, Br, -CH 3 or -CF 3 with the proviso that Y, and Y 2 are not simultaneously H. The mesomorphic compound is effective for providing a ferroelectric liquid crystal composition showing an improved low-temperature operation characteristic and a decreased temperature-dependence of response speed. |