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

Abstract


Novel series of Co(II), Ni(II) and Cu(II) transition metal complexes were synthesized from the Schiff base ligands HL1HL4 derived from 2-amino-6-nitrobenzothiazole with various aromatic aldehydes, i.e., 4-methylbenz­alde­hyde, 4-ethylbenzaldehyde, 2-hydroxybenzaldehyde and 4-hydroxybenz­al­dehyde, respectively. The ligands HL1HL4 and their metal (II) complexes were characterized by atomic absorption spectroscopy (AAS), magnetic susceptibility and molar conductance measurements, and UV–Vis, FT-IR and NMR spectroscopic tech­niques. The spectroscopic studies revealed that the complexes of HL1HL3 coor­dinated in an octahedral environment and L4 in square planar/tetrahedral geo­metry. The ligands HL1HL4 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 the complexes of HL4 possess greater inhibition activity towards C. albicans. The nonlinear optics (NLO) activities of ligands HL1HL4 were determined. The obtained results showed that ligands HL1 and HL2 have greater second harmonic generation (SHG) efficiency than HL3and HL4.

Keywords


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

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

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