Spectral, NLO and antimicrobial studies of Co(II), Ni(II) and Cu(II) complexes of Schiff base ligands of 2-amino-6-nitrobenzothiazole

Chinnaraj Kanagavalli, Murugesan Sankarganesh, Jeyaraj Dhaveethu Raja, Manivannan Kalanithi


A novel series of transition metal complexes of Co(II), Ni(II) and Cu(II) were synthesized from the Schiff base ligands (L1 to L4) derived from 2-amino-6-nitrobenzothiazole with various aromatic aldehydes such as 4‑methylbenzaldehyde, 4-ethylbenzaldehyde, 2-hydroxybenzaldehyde and 4‑hydroxybenzaldehyde. The ligands (L1 to L4) and their metal (II) complexes were characterized by AAS, magnetic susceptibility, molar conductance measurements, UV–Vis, FT-IR and NMR spectroscopic techniques. The spectroscopic studies reveal that complexes of L1 to L4coordinate in an octahedral environment and L4 in a square planar / tetrahedral geometry. The L1 to L4 and their metal(II) complexes were screened for their antimicrobial activities against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Candida albicans. The results suggest that, complexes of L4 possess greater inhibition activity towards Candida albicans. The NLO activity of the ligands L1 to L4 was determined. These obtained results show that, ligands (L1 and L2) are found to have more SHG efficiency than L3 and L4.


aldehydes; metal(II) complexes; spectroscopic; AAS; biological activity

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DOI: https://doi.org/10.2298/JSC180521101K

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