Patent ID: 7695980

Claim:
A compound according to the formula: wherein one of the fused rings I and II is phenyl and the other is an aromatic five ring heterocycle having one heteroatom, R 1 and R 2 are independently selected from the group consisting of hydrogen, R, halogen, —NR 2 , —OR, —OH, —S(O) 2 OH, —CN, —SCN, —SSR, —SR, —C(O)R, —C(O)H, —C(O)OR, —C(O)OH, —NHC(O)R, —C(O)NHR, —C(O)NH 2 , —S(O) 2 NHR, and —S(O) 2 NH 2 ; R is selected from the group consisting of alkyl, alkenyl, alkynyl, and aralkyl, wherein said alkyl, alkenyl or alkynyl can contain up to 20 heteroatoms; R 3 is selected from the group consisting of alkyl, alkenyl, alkynyl, and alkyl, alkenyl, alkynyl, aralkyl groups that further comprise a coupling moiety, wherein said alkyl, alkenyl, or alkynyl can contain up to 20 heteroatoms; A comprises a counter-ion to balance a net charge of the compound; and Z comprises a leaving group selected from the group consisting of —O—V, —S—V, —N(V)—SO 2 —V′, —O—N(V)—SO 2 —V′, —S—N(V)—V′, —O—N(V)—C(O)—V′, —O—N═C(V)—V′, and —O—N═C(V)—Cl, wherein V and V′ are independently selected from the group consisting of alkyl, substituted alkyl, and an aryl moiety corresponding to the formula: with the proviso that at least one of V or V′ must be the aryl moiety and wherein said substituted alkyl is substituted with one or more compounds selected from the group consisting of —S(O) 2 OH, fluorine, and chlorine.