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Synthesis, characterization and antimicrobial activity of some transition metal complexes of Schiff base and Neutral bidentate ligand

Ketul N.Patel, Sandip G.Patel, Yogendrasinh J.Thakor, Vasishta D.Bhatt, Smita S.Srivastava

Themixed ligand complexes ofMn(II), Fe(II), Co(II),Ni(II),Cu(II) and Zn(II) with the Schiff bases, formed by condensation of 2-Hydroxy-1- naphthaldehyde/Salicylaldehyde and p-Anisidine with Neutral bidentate ligand 4-Hydroxybenzldehyde/3-Ethoxy-4-hydroxybenzaldehyde (Ethylevanilline) and o-Phenylinediamine have been synthesized and characterized. The complexes have been characterized with the help of elemental analysis (C, H and N), magnetic measurements, thermo gravimetric analysis and their structural configuration have been determined by various spectroscopic (electronic, IR, UV-visible) techniques. The elemental analysis data suggest that the stoichiometry- of the complexes to be 1 : 2 : 1 [M : L1 : L2] ratio. The infrared spectral data showed the coordination sites of the free ligand with the central metal ion. The electronic absorption spectral data revealed the existence of an octahedral geometry for Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes. Supported their geometrical structures which confirmed by the electronic absorption spectra. The thermo gravimetric analysis data of the complexes display the existence of hydrated water/ crystal water molecules. All prepared compounds were also evaluated for their antibacterial and antifungal activities by theAgarwell diffusionmethod. The antibacterial activity was tested against the bacteria Bacillus subtilis (Gram positive), Escherichia coli (Gram negative). The antifungal activity was tested against Aspergillus niger. The results obtained were evaluated with antibacterial and antifungal standard Streptomycin.