Patent ID: 7160485

Claim:
A sulfoderivative compound, comprising: a sulfonated perylenetetracarboxylic acid dibenzimidazole (PTCA DBI) having a general structural formula selected from one of where X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , and X 8 are peripheral substituents individually selected from —H, —OH, and —SO 3 H, such that at least one of the peripheral substituents is not H, and at least one of X 1 to X 8 in formula I is OH; M is one or more counter ions and j is the number of counter ions associated with a molecule; Z 1 and Z 2 are bridging substituents individually selected from —O—, —SO 2 —, —SO 2 —O—; A 1 and A 2 are fragments having the general structural formula Y is one or more fragments substituents individually selected from —H, —Cl, —F, —Br, —Alk, —OH, —OAlk, —NO 2 , and —NH 2 ; n is an integer selected from 0, 1, and 2; and p is an integer selected from 0, 1, 2, 3, and 4.