Patent ID: 6852248

Claim:
A composition comprising a liquid-crystal mixture and a compound having a formula A: wherein X is selected from the group consisting of wherein D is selected from the group consisting of NR a R b , OR a , SR a , PR a R b , and R c ; wherein A is selected from the group consisting of: wherein R a , R b , and R c are the same or different and are each independently selected from the group consisting of: H; a linear alkyl group; a branched alkyl group; a cyclic alkyl group; —(CH 2 CH 2 O) α —(CH 2 ) β OR A1 ; —(CH 2 CH 2 O) α —(CH 2 ) β NR A2 R A3 ; —(CH 2 CH 2 O) α —(CH 2 ) β CN; —(CH 2 CH 2 O) α —(CH 2 ) β Cl; —(CH 2 CH 2 O) α —(CH 2 ) β Br; —(CH 2 CH 2 O) α —(CH 2 ) β I; —(CH 2 CH 2 O) α —(CH 2 ) β -Phenyl; —(CH 2 ) α (CF 2 ) γ CF 3 ; and an aryl group; wherein R d , R e , R f , R l , R m , R n , R o , R p , R q , R r , R s , R t , R u , R v , R w , and R x are the same or different and are each independently selected from the group consisting of: H; a linear hydrocarbon group; a branched hydrocarbon group; a cyclic hydrocarbon group; a linear alkyl group; a branched alkyl group; a cyclic alkyl group; —(CH 2 CH 2 O) α —(CH 2 ) β OR A1 ; —(CH 2 CH 2 O) α —(CH 2 ) β NR A2 R A3 ; —(CH 2 CH 2 O) α —(CH 2 ) β CN; —(CH 2 CH 2 O) α —(CH 2 ) β CI; —(CH 2 CH 2 O) α —(CH 2 ) β Br; —(CH 2 CH 2 O) α —(CH 2 ) β I; —(CH 2 CH 2 O) α —(CH 2 ) β -Phenyl; —(CH 2 ) α (CF 2 ) γ CF 3 ; and an aryl group; wherein the hydrocarbon group is saturated or unsaturated; wherein R g , R h , R i , and R k are the same or different and are each independently selected from the group consisting of: H; a linear hydrocarbon group; a branched hydrocarbon group; a cyclic hydrocarbon group; a linear alkyl group; a branched alkyl group; a cyclic alkyl group; —(CH 2 CH 2 O) α —(CH 2 ) β OR A1 ; —(CH 2 CH 2 O) α —(CH 2 ) β NR A2 R A3 ; —(CH 2 CH 2 O) α —(CH 2 ) β CN; —(CH 2 CH 2 O) α —(CH 2 ) β Cl; —(CH 2 CH 2 O) α —(CH 2 ) β Br; —(CH 2 CH 2 O) α —(CH 2 ) β I; —(CH 2 CH 2 O) α —(CH 2 ) β -Phenyl; an aryl group; —(CH 2 ) α (CF 2 ) γ CF 3 ; —CO 2 R d ; and —COR d ; wherein the hydrocarbon group is saturated or unsaturated; wherein each aryl group is optionally independently selected from the group consisting of wherein R A1 , R A2 , R A3 , R A4 , R A5 , R A6 , R A7 , and R A8 are the same or different and are each independently selected from the group consisting of H, a linear alkyl group, a branched alkyl group, and a cyclic alkyl group; wherein E is selected from the group consisting of S, O, and NR s ; wherein the alkyl group is optionally substituted or unsubstituted and optionally includes up to 25 carbon atoms; wherein α is an integer that is greater than or equal to 0 and less than or equal to 25; wherein β is an integer that is greater than or equal to 0 and less than or equal to 25; and wherein γ is an integer that is greater than or equal to 0 and less than or equal to 25.