Green Synthesis, Characterization and Antimicrobial Studies of Ni(II) and Cu(II) Schiff Base Complexes

Salihu Sani

Abstract

Solvent-assisted mechanochemical reaction was used to synthesize new transition metal complexes of Ni(II) and Cu(II) with Schiff base ligand (H2L) obtained from condensation of 2-hydroxy-1- napthaldehyde with 2 aminobenzimidazole. Melting point/decomposition temperature, solubility test, FT-IR, powder x-ray analysis, conductivity measurement, magnetic susceptibility, elemental microanalysis, and UV/VIS spectral investigations were used to characterize the Schiff base and complexes. The complexes are of varied colours and have sharp melting points, and they were formed in moderate yields. Elemental analysis was used to determine the purity and composition of the Schiff base and metal(II) complexes, revealing a metal: Ligand ratio of 1:2. According to the FT-IR spectra, the complexes were found to be coordinated by the Schiff base's azomethine nitrogen and phenolic oxygen. The appearance of additional bands at 1581 and 1609 cm-1 due to the respective v(M-N) and v(M-O) in the metal complexes provided further conclusive proof of the Schiff base's coordination with the metal ions. According to the power x-ray diffraction analysis, the patterns of the grinded mixture were distinct from the initial constituents, showing that the starting materials were changed into product. Every one of the complexes get a square planar structure, as per magnetic susceptibility tests. Molar conductance measurements revealed that the complexes are non-electrolytes. Complexes are soluble in polar solvents such as DMF and ethanol. Bacterial species such as Escherichia coli and Staphylococcus aureus, as well as fungal species such as Candida albicans and Aspergillus fumigatus, were used to evaluate the complexes' antibacterial properties. At varied concentrations, certain complexes demonstrated good activity against the tested organism.

Green Synthesis, Characterization and Antimicrobial Studies of Ni(II) and Cu(II) Schiff Base Complexes

Abstract

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