Copper (II) and cadmium (II) complexes of 5-(4′-derivatives phenyldiazo)-3-phenyl-2- thioxo-4-thiazolidinone (HLn) were prepared, their compositions and physicochemical properties were characterized by elemental analysis, magnetic suseptibility measurements, and infrared, electronic spectra. The novel complexes have the stoichiometric formulae [Cu (HLn)(OAc) n (H2O)(X)](OAc= acetate, X= H2O or acetate) and [Cd (L)(OAc)(H2O)], ...