Patent ID: 6878701

Claim:
A compound of Formula II, wherein A represents a linking group selected from the group consisting of (cis or trans)-1,5-cyclooctylene; (cis or trans)-1,3-dimethylcyclohexane-α,α′-diyl; para-xylene-α,α′-diyl; meta-xylene-α,α′-diyl; 1,3-phenylene; biphenyl-3,3′-diyl; 4,4′-dimethyl-bibenzyl-α,α′-diyl; 4,4′-dimethyl-diphenylmethane-α,α′-diyl; 4,4′-dimethyl-cis/tran-stilbene-α,α′-diyl; 2,6-bis(4′-methyl-phenyl)pyridine-α,α′-diyl; 3,3′-dimethyl-biphenyl-α,α′-diyl; and 2,7-dimethyl-9H-fluorene-α,α′-diyl; and B represents a linking group selected from the group consisting of: N,N′-dimethyl-diamino-methylene; N,N′-dimethyl-diamino-dimethylene and N,N′-dimethyl-diamino-trimethylene; and R 5 , R 6 , R 7 and R 8 , independently of each another, represent hydrogen, halogen, trihalogenmethyl, alkyl, alkynyl, amino, nitro, or cyano.