Ferroelectric liquid crystals for nonlinear optics applications

Details Ferroelectric liquid crystals for nonlinear optics applications Ferroelectric liquid crystals for nonlinear optics applications

1995-05-26

1997-06-10

Wu, Shean C.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229964, 25229965, 25229967, 252582, 560 43, 560 48, 564441, 564442, 564443, C09K 1912, C07C22900, C07C21100, F21V 900

Patent

active

056372566

ABSTRACT:
This invention provides chiral nonracemic compound of formula: ##STR1## wherein n and m are 0 or 1, but one of n or m must be 1; k=0 or 1; B=COO or OOC; X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are either H, an electron donor or an electron acceptor where at least one of the groups X.sub.1, X.sub.2, X.sub.3 or X.sub.4 is an electron acceptor and at least one of these groups is an electron donor and when one of X.sub.1 or X.sub.3 is an electron donor, the other is an electro a acceptor and when one of X.sub.2 or X.sub.4 is an electron donor, the other is an electron acceptor; and R.sub.1 and R.sub.2 can be various substituted and unsubstituted alkanes and monoalkenes. Compounds provided include those where one of R.sub.1 or R.sub.2 is a chiral non-racemic tail group, particularly a group selected from --O--C.sup.* H(CH.sub.3)R.sub.c, --O--C.sup.* H(CH.sub.3)COOR.sub.d, and --O--CH.sub.2 C.sup.* HF--C.sup.* HF--R.sub.2 in which the .sup.* indicates an asymmetric carbon enriched in one stereoconfiguration where R.sub.c, R.sub.d, and R.sub.e can be various substituted and unsubstituted alkanes and monoalkenes. The compounds of this invention are useful in the preparation of FLC mixtures and non-linear optical materials.

REFERENCES:
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patent: 5335303 (1994-08-01), Buchecker
patent: 5543078 (1996-08-01), Walba et al.
Walba et al. (1991) ACS Symposium Series for Materials for Nonlinear Optics, Marder et al. (eds.), Apr. 22-27, 1990, pp. 484-496.
Walba et al. (1991) Mol.Cryst. Liq. Cryst. 198:51-60.
Walba et al. (1993) Ferroelectrics 148:435-442.
Kapitza, H. et al. (1990) Abstract of oral presentation at the 13th International Liquid Crystal Conference, Jul. 22-27, 1990, University of British Columbia, Vancounver, BC, Canada.
Kapitza, H. et al. (1990) Adv. Mat. 2(11):539-543.
Walba et al. (1990) Abstract of oral presentation at the 199th National American Chemical Society Meeting, Boston, MA, Apr. 22-27, 1990.

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