The mixed ligand complexes of the type [ML1L2]Cl2. Where M=Cr(III), Mn(II), Co(II),Ni(II) and Cu(II) with L1= Pyruvic acid thiosemicarbazone L2=Acetone semicarbazone, have been synthesized, by the reactions of metal chlorides with two different semicarbazones in 1:1:1 molar ratios. The resulting products have been characterized on the basis of elemental analysis, magnetic measurement, IR and Electronic spectra, conductivity measurement, thermal analysis, antimicrobial activities. The metal complexes show ratio 1:1:1 with metal, ligand L1 and ligand L2.The ligands are bonded through oxygen and nitrogen and sulphur to metal ion.

There is great interest in the study of mixed ligand complexes of transition metals with oxygen, nitrogen and sulphur donor ligands. Coordination complexes of Co(II)) of the type Co(L 1 L 2)Cl 2 Where L 1 =salicylaldehyde semicarbazone and L 2 =salicylaldehyde oxime, ortho hydroxy acetophenone oxime, anthranilic acid, benzaldehyde semicarbazone, acetophenone semicarbazone and acetone semicarbazone have been prepared by the reaction of metal chloride with two ligands L 1 and L 2 in the ratio 1:1:1 molar ratio. The resulting complexes have been characterized on the basis of elemental analysis, magnetic measurement, IR and UV spectral analysis, conductivity measurement, thermal analysis, antimicrobial activities. Analysis of results reviles that the complexes shows octahedral geometry, electrolytic nature and having more antimicrobial activity than the ligands. The ligands are bonded through oxygen and nitrogen.

The mixed ligand complexes of the type [M(L 1)(L 2)]Cl 2 (where M= Mn (II),Fe(III),Co(II), Ni(II) and Cu(II) and L 1 = Acetophenone semicarbazone, L 2 =Acetone semicarbazone) have been synthesized by the reactions of metal chlorides with two different semicarbazone compounds in 1:1:1 molar ratios. The resulting complexes have been characterized on the basis of elemental analysis, magnetic measurement, IR and electronic spectra, conductivity measurement. The metal complexes shows ratio 1:1:1 with metal, ligand L 1 and ligand L 2 .The ligands acts as bidentate ligands and are bonded through oxygen and nitrogen to metal ion. The two coordination positions are occupied by two water molecules. The complexes have octahedral structure.