Patent ID: 7041809

Claim:
Substituted 8-heterocylic azo-5-aminoquinoline dyes of the following formula reacted with transition-metal ions selected from the group consisting of Cr(III), Mn(II), Fe(II,III), Co(II,III), Ni(II), Cu(II), Zn(II), Pd(II) and Pt (II) in a 1:1 or 2:1 (organic:metal) by weight ratio: wherein: A represents an aromatic bi-heterocyclic radical containing at least one nitrogen atom which, along with the nitrogen atoms of the azo link and quinoline moieties, can participate in the coordination of transition-metal ions, each X independently being an optionally substituted alkyl, optionally substituted aryl, optionally substituted alkoxide, optionally substituted amine, optionally substituted amide, optionally substituted ester, sulfo or salts thereof, sulfonamide, carboxy or salts thereof, phospho or salts thereof, halide, cyano, or nitro, among others, n is an integer value 0–5, and at least one of R 1 and R 2 each independently being optionally substituted alkyl, optionally substituted aryl, optionally substituted —C(O)alkyl, a substituted —C(O)aryl, optionally substituted —SO 2 alkyl, or optionally substituted —SO 2 aryl and one of R 1 and R 2 may also be hydrogen.