Polymetallic complexes. Part-XXX. complexes of cobalt-, nickel-, copper-, zinc-, cadmium- and mercury(II) with doubly-tridentate chelating azo-dye ligand

The azodye 1,4-bis(2'-hydroxy-3'-carboxy-5'-sulphonic phenylazo)benzene behaves as a doubly-tridentate chelating ligand and forms oxo-bridged tetranuclear complexes with divalent Co, Ni, Cu, Zn, Cd and Hg. The complexes were characterised on the basis of analytical, conductance, magnetic susceptibility, molecular weight, ir, esr and electronic spectral data. (author). 17 refs., 1 tab