Patent ID: 7723462

Claim:
An electro-optical chromophore having general Formula I: wherein: C* denotes a chiral carbon atom; D is an electron donating group; B comprises at least one bivalent ring; R 2 and R 3 are different from one another; and R 2 is selected from the group consisting of H, substituted or unsubstituted C 1 -C 10 alkyl, substituted or unsubstituted C 2 -C 10 alkenyl, substituted or unsubstituted C 2 -C 10 alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted alkylaryl, substituted or unsubstituted carbocycle, substituted or unsubstituted heterocycle, substituted or unsubstituted cyclohexyl, and (CH 2 ) n —O—CH 2 ) n where n is an integer from 1 through 10; and R 3 is selected from the group consisting of substituted or unsubstituted aryl, substituted or unsubstituted alkylaryl, substituted or unsubstituted carbocycle, substituted or unsubstituted heterocycle, substituted or unsubstituted cyclohexyl, and (CH 2 ) n —O—(CH 2 ) n where n is an integer from 1 through 10; or R 2 and R 3 together form a ring structure or a substituted ring structure; and the compound of Formula I has, at any location, at least one terminal —SH group capable of reacting with a maleimide bond.