abstract |
A novel liquid crystalline compound having a large dielectric anisotropy value, a small change in the threshold voltage depending upon temperatures, and an improved solubility in other liquid crystal materials at low temperatures, and a liquid crystal composition containing the compound are provided, which liquid crystalline compound is expressed by the formula (1) wherein R is H or an alkyl group of 1 to 10C; ℓ is an integer of 1 to 9; m, n and o are each independently 0 or 1; A<sub>1</sub>, A<sub>2</sub> and A<sub>3</sub> are each independently trans-1,4-cyclohexylene group, 1,4-pheylene group, one or more H atoms on the ring of which group may be replaced by F, or the like group; Z<sub>1</sub>, Z<sub>2</sub> and Z<sub>3</sub> are each independently -COO-, etc., but at least one member of them is -COO-; X is CF<sub>3</sub>,etc.; and Y<sub>1</sub> and Y<sub>2</sub> are each independently H or F. |