Solid State Synthesis, Spectroscopic and X-ray Studies of Cu(II) Schiff base Complex Derived from 2-Hydroxy-3-methoxybenzaldehyde and 1,3- Phenylenediamine

Abstract

Complex of Cu (II) with Schiff base derived from 2-Hydroxy-3-methoxybenzaldehyde and 1,3- Phenylenediamine have been mechanochemically (liquid-assistant grinding) synthesized and characterized by infrared, powder x-ray diffraction, energy dispersive X-ray and CHN analysis. Evidence from Infrared spectral study indicated a strong band in the spectra of free ligand occurring at 1619 cm^-1 which assigned to ν(C=N). It shifted to lower frequency region 1587 cm-1 in the complex indicating the involvement of nitrogen atom of azomethine group. The coordination of Schiff base with the metal ion is confirmed by the appearance of low frequency band at 461 cm^-1 due to metal-oxygen ν(M-O) and at 579 cm^-1 due to metal azothemine nitrogen (MN) band. The Powder-XRD analysis reveals that, the patterns of the ground mixture were entirely different from the starting constituents, indicating that, all the starting materials were transformed to product, furthermore the colour of the complex was different from that of the Schiff base suggesting the formation of coordination compound. The antimicrobial activities of the synthesized Schiff base and complex were tested using serial dilution method, against bacterial strains (Escherichia coli, and Staphylococcus aureus) and fungal strain (Aspergillus flavus and Aspergillus niger). It has been observed that the complex has higher activity than the free Schiff base ligand.

Keywords: Mechanochemistry, Power-X-ray, Azomethine, Ligand, Complex.