| abstract |
There are proposed liquid crystalline compounds expressed by formula (1) having high elastic constant ratio, low viscosity, stability as well as superior compatibility with other liquid crystalline compounds such as those expressed by general formula (2) at low temperatures. In formula (1), R1 and R2 are each independently a cyano group, a halogen atom, an alkyl group with from 1 to 20 carbon atoms, etc., X1, X2 and X3 are independently each other -CH2CH2-, -CO-O-, -O-CO- etc. or a covalent bond, and rings A, B, C and D denote each independently a 1,4-cyclohexylene ring or a bicyclo[1.1.0]butane ring etc. In formula (2), R3 denotes an alkyl group with from 1 to 10 carbon atoms, Y denotes F or C1, Q1 and Q2 denote each independently H or F, and Z1 denotes -CH2CH2- or a covalent bond. |