?POLYMETALLIC COMPLEXES Part XLIV. Complexes of Cobalt (II), Nickel (II), Copper (II), Zinc (II), Cadmium (II) and Mercury II With Doubly-Bidentate 0 N Z N 0 Donor Chelating Azo Dye Ligands, 4,4’-Bis (2’-Hydroxy-l’-Naphthyl-Azo)-Diphenyl and l,4-. Pakistan Journal of Scientific & Industrial Research 1995, 38 (9-10), 337-340.