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Abstract
Three mononuclear nickel(II) and copper(II) complexes, [Ni(L)2(py)2] (1), [Ni(L)2(DMF)(H2O)] (2), and [Cu(L)2] (3), where HL = 2-((Z)-(4-methoxyphenylimino)methyl)-4,6-dichlorophenol, py = pyridine and DMF = N,N-dimethylformamide, have been synthesized and their structures determined by single crystal X-ray analysis. Complexes 1–3 crystallized in the monoclinic system of the space groups C2/c, P21/n, and P21/c, respectively. The crystal structures of 1 and 2 present an octahedral geometry at the metal center and 3 shows a square-planar geometry. The FT-IR spectra, UV–vis spectra, and magnetic susceptibility measurements agree with the observed crystal structures. EPR spectra indicate a dx2–y2 ground state (g|| > g⊥ > 2.0023 and A|| > A⊥) for 3 at RT and LNT. The results of simultaneous TG-DTA analyses of 1 and 3 showed the final degradation products are NiO for 1 and CuO for 3. The Schiff base (HL) behaves as monobasic bidentate ligand possessing N and O donor atoms. Electrochemical properties for the complexes are similar and involve two irreversible redox processes. Complex 3 exhibits the ability to inhibit jack bean urease, although its Schiff base has no ability to inhibit urease. Complex 1 exhibits more active scavenging effects against O2− than HL, 2 and 3 under the same conditions. Antibacterial screening activities of these complexes were also investigated.
Acknowledgements
Author thanks the Sophisticated Analytical Instrument Facility (SAIF), Single Crystal X-Ray Division, IIT Chennai (1 and 3) and Sophisticated Instrumentation Centre (SIC) IIT Indore (2) for single crystal data collection, respectively. Author thanks the Head RSIC (SAIF), IIT Mumbai for EPR measurements. The Head RSIC (SAIF), Central Drug Research Institute, Lucknow is also thankfully acknowledged for providing analytical and spectral facilities.