A liquid crystalline compound expressed by the formula (1)
(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)
and a liquid crystal composition using the same, are provided,
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.
由式(1)表示的液晶化合物
(其中 R₁ 是 1-12C 的烷基,烷基中的一个 CH₂ 基团或两个不相邻的 CH₂ 基团可被选自 0 原子、-CO- 基团、-O-CO- 基团、-CO-O- 基团和-CH=CH- 基团中的取代基取代;X 是共价键、-CH₂CH₂-、-CH=CH-、-C≡C-、-CH₂O-、-OCH₂-、-CO-O- 或 -O-CO-;Y₁ 和 Y₂ 各自独立地为 H、F、Cℓ 或甲基;环 A、B 和 C 各自独立地为苯环或
环己烷环,且可被卤素原子或甲基取代;以及 ℓ、m、n 和 p 各自独立地为 1 或 2,且 ℓ+m 为一个或多个)
的液晶组合物、
该液晶组合物具有较大的 Δn、较低的粘度和较高的电压保持率,并在较宽的温度范围内呈现向列液晶相,还具有极高的Δε和较低的驱动电压,可用于 TFT。