Ferroelectric liquid crystal composition and liquid crystal device.

Abstract

A ferroelec. liq. crystal compn. contains at least one (hetero)arylacetylene deriv. [I; X, Y = H, F; Z = single bond, O; Z1 = CO2, O; ring A = phenylene, pyridinediyl, pyridazinediyl; ring B = phenylene, pyridinediyl; n = 0, 1; R, R1 = C1-11 linear or branched alkyl] and at least one phenylpyrimidine deriv. (II; Z2, Z3 = single bond, O; R, R1 = C1-15 linear or branched alkyl; n = 0, 1). Addnl. it contains optically active ethers (III; X1 = C≡C, single bond; ring A = phenylene, pyridinediyl, pyridazinediyl; ring B = phenylenee, pyridinediyl; R, R1 = C1-15 linear or branched alkyl; Z4 = single bond, O; star denotes an asym. C atom) and/or optically active esters or ethers (IV; n = 0, 1; X2 = C≡C, CH2CH2, single bond; Y1 = CO2, CH2O; ring C = phenylene, cyclohexylene, pyridinediyl; ring D = phenylene, cyclohexylene, pyridinediyl; ring D = phenylene, pyridinediyl; 2,6-naphthylene, cyclohexylene; R, R1 = C1-15 linear or branched alkyl; Z5 = single bond, O; star denotes an asym. C atom), etc. Said liq. crystal compn. shows at least chiral nematic, smectic A, and chiral smetic C phase at the lower temp. side of a isotopic liq. This liq. crystal compn. shows a broad range of working temp., good orientation and memory properties, high speed response. at room temp., and large tilt angles. [on SciFinder(R)]