Hexenediyne derivative and a liquid crystal composition

Details Hexenediyne derivative and a liquid crystal composition Hexenediyne derivative and a liquid crystal composition

1995-03-14

1996-09-10

Wu, Shean C.

Compositions

Liquid crystal compositions

25229961, 359103, 568631, 568634, 568669, 570128, C09K 1952, C09K 1934, C07C 2208, C07C 43215, C07C 43225

Patent

active

055543162

ABSTRACT:
A novel compound having superior characteristics as a liquid crystal material and having a good stability under usual use environment, and a composition having improved viscosity, optical anisotropy and other properties, and further a liquid crystal display element are provided,
the compound being a hexenediyne compound expressed by the formula ##STR1## wherein R and R' each represent an alkyl group or an alkoxy group, independently of each other; rings A and B each represent 1,4-cyclohexylene or 1,4-phenylene; and X represents H or F), and particularly when fluorine atom is introduced into the central part of the molecule of the compound, the viscosity is notably lowered; and when a liquid crystal composition is composed of the compound as its component, the operation temperature range of the liquid crystal composition is broadened, and the high speed response becomes possible due to the viscosity reduction, and when the cell thickness is reduced, a good display can be realized.

REFERENCES:
"Diacetylenic Liquid Crystals", Mol. Cryst. Liq. Cryst., 1978, vol. 48, pp. 175-182.
"Derivative des Stilbens," Fluessigkeltekristalle, Fluessige Kristallen, Leipzig VEB Deutcher Verlag fuer Grundstoff Industrie, 1975, 49.
CA 113: 242024, 1990.
Journal of Organic Chemistry, vol. 59, No. 23, 1994 Easton US, pp. 7142-7143, B. Konig et al. "Synthesis and Photoinduced cis-trans of Diaryl Enediyne Chromophores".

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