Synthesis and Characterization of Nickel(ii), Zinc(ii), and Cadmium(ii) Mixed-Ligand Complexes With 2,2′-Bipyridylamine and Phenols

The present investigation reports the synthesis of mixed-ligand complexes of the type MAL, where M=Ni(II), Zn(II), Cd(II) A=2,2′-bipyridylamine and H2L1=catechol, H2L2=pyrogallol, H2L3=2,3-dihydroxynaphthalene, H2L4=protocatechuic acid. Their structures have been elucidated on the basis of elemental analyses, conductivity, thermogravimetric, magnetic moments and IR spectroscopy. The results are in accord with an octahedral environment around the central metal ions except for Ni(II). All chelates are diamagnetic. A study of the thermal properties has also been carried out.