alexa Abstract | Preparation, Spectroscopic Characterization and Biological Activities of Co(II) and Ni(II) Complexes with 2-Aminobenzonitrile and Octanoate Ligands

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The Co(II) and Ni(II) complexes with 2-Aminobenzonitrile (ABN) and octanoate ion (OC) were prepared using microwave irradiation. The prepared complexes were characterized by elemental analysis, metal estimation (volumetric & calorimetric method), electrical conductivity, UV-Visible, IR and Far-IR spectral studies. The antibacterial and antifungal activities of both ABN and octanoate ligands and the metal complexes at various concentrations were carried out by disc diffusion method with the following microorganisms viz., E-coli, Enterobacter, Klebsiella, Staphylococcus aureus, Streptococci, Salmonella typhi, P.aeruginosa, C.albicance, Aspergillus Flavus and Aspergillus niger. From the elemental analysis and metal estimation, the formulae for the prepared complexes are [ML2X2] (where M=Co(II) & Ni(II), L=2-Aminobenzonitrile and X=octanoate). The UV-Visible spectra lead to the probable geometry of the complexes. The UV-Visible spectral data suggest distorted octahedral geometry around Co(II) & Ni(II) complexes. Entry of the ligands into the coordination sphere was confirmed from IR spectra. The IR spectral data indicate both ABN and octanoate can coordinate to the metal ions. The Far-IR spectra of the complexes indicate the bond between metal and linked atom of the coordination group. From far-IR data the metal ions linked to –NH2 & -C≡N nitrogen atom of ABN and oxygen atom of octanoate ion. The antibacterial and antifungal activities of the complexes compared with those of pure ABN and sodium octanoate. The results indicate that Co(II) & Ni(II) complexes were active against S. aureus and , P.aeruginosa compared to the pure ligands.

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Author(s): R. Govindharaju, S. Balasubramaniyan, K. Rajasekar, T. Ramachandramoorthy

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