A new series of Cu(II) and Ni(II) complexes of NO bidentate 4-NO2 -benzoylhydrazones: synthesis, characterization, and biological studies

A series of new nickel(II) and copper(II) hydrazone complexes 1 14, containing a bidentate NO-donor hydrazone ligand, derived from 4-nitrobenzoylhydrazide and several aliphatic and aromatic aldehydes were synthesized, and their chemical structures were confirmed by means of FT-IR, UV-Vis, 1 H and 13 C NMR, mass spectral data, conductance measurements, and elemental analyses. The spectral data of the newly synthesized complexes show the formation of a 1:2 [metal:ligand] ratio. The ligands and their complexes were also investigated for their possible in vitro antimicrobial activities against S. aureus, S. epidermidis, E. coli, K. pneumonia, P. aeruginosa, P. mirabilis, E. faecalis, and C. albicans. Among the fourteen new complexes synthesized, complex Cu(L4)2 (7) containing a direct aromatic moiety in the ligand (HL7) was found to be most active against selected test microorganisms.

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