Patent ID: 7914707

Claim:
A compound selected from the group consisting of formula 2, formula 3 and formula 4: wherein each of R 1 ˜R 11 independently represents —H, —F, —Cl, —Br, —I, —SH, —COOH, —PO 3 H 2 , —NH 2 , —NO 2 , —O(CH 2 CH 2 O) n H (wherein n is an integer of 1˜5), C 1 ˜C 12 alkyl group, C 1 ˜C 12 aminoalkyl group, C 1 ˜C 12 hydroxyalkyl group, C 1 ˜C 12 haloalkyl group, C 2 ˜C 12 alkenyl group, C 1 ˜C 12 alkoxy group, C 1 ˜C 12 alkylamino group, C 1 ˜C 12 dialkylamino group, C 6 ˜C 18 aryl group, C 6 ˜C 18 aminoaryl group, C 6 ˜C 18 hydroxyaryl group, C 6 ˜C 18 haloaryl group, C 7 ˜C 18 benzyl group, C 7 ˜C 18 aminobenzyl group, C 7 ˜C 18 hydroxybenzyl group, C 7 ˜C 18 halobenzyl group, or nitrile group (—CN), wherein at least one of R 1 —R 11 of formula 2 is a nitrile group; wherein each of R 1 ˜R 3 is the same as defined in the above formula 2; and wherein each of R 1 ˜R 3 is the same as defined in the above formula 2.