| abstract |
A liquid crystalline compound expressed by the formula (1)n n (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≡C-, -CH₂O-, -OCH₂-, -CO-O- or -O-CO-; Y₁ and Y₂ each independently are H, F, Cℓ 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) nand a liquid crystal composition using the same, are provided, n which liquid crystal composition has a large Δn, 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 Δε and a low driving voltage and is useful for use for TFT. |