Oxalaceto(2-Chloro–6–Fluoro–Benzylidene) and Oxalaceto(2-Chloro-5–Nitrobenzylidene) Hydrazides and Spectroscopic Studies of the Complexes

Abstract

The synthesis, structure, spectral and biological studies of Cu(II), Mn(II), and Zn(II)  complexes of two kind of hydrazides ligand are described. The ligands was derived by the condensation of oxalaetic acid with hydrazine hydrate later substituted with two kind of benzaldehyde. These metal complexes were characterized by elemental analysis, molar conductance, magnetic moment measurements, IR, and spectral data. An octahedral geometry was proposed for all the metal complexes. It is evident from the IR data that in all the complexes, only two part of the ligands is coordinated to the metal ion resulting in binuclear kind of complexes. The ligand coordinates through the nitrogen atoms (C=N) of the azomethine  and oxygen atom of the carbonyl compound (C=O) of the hydrazide moiety. The formulations,- [Cu(HL¹)], [Mn(HL¹)], [Zn(HL¹)], and [Cu(HL²)], [Mn(HL²)], [Zn(HL²)], are in accordance with elemental analyses, physical and spectroscopic measurements. The complexes are soluble in organic solvents dimethylsulphoxide ( DMSO). Molar conductance values in DMSO indicate the non electrolytic nature of the complexes. The ligands and metal complexes show a good activity against the bacteria; B. Subtilis, E.coli and S.aureus and fungi A.niger, A.flavus and C.albicans. The antimicrobial results also indicate that the metal complexes are better antimicrobial agents as compared to the ligands.