| 摘要 |
A liquid crystalline compound expressed by the formula (1) <CHEM> (wherein R1 is an alkyl group of 1-12C, and one CH2 group or two CH2 groups not adjacent to each other in the alkyl group may be substituted by substituent(s) selected from among 0 atom, -CO- group, -O-CO- group, -CO-O- group and -CH=CH- group; X is covalent bond, -CH2CH2-, -CH=CH-, -C IDENTICAL C-, -CH2O-, -OCH2-, -CO-O- or -O-CO-; Y1 and Y2 each independently are H, F, C l or methyl group; rings A, B and C each independently are benzene ring or cyclohexane ring, and may be substituted by halogen atom(s) or a methyl group(s); and l , m, n and p each independently are 1 or 2 and l +m is one or more> and a liquid crystal composition using the same, are provided, which liquid crystal composition has a large DELTA n, a low viscosity and a high voltage retention and exhibits a nematic liquid crystal phase within a broad temperature range, and further has a very high DELTA epsilon and a low driving voltage and is useful for use for TFT. |
