Spectral and Thermal Characterization of Mn(II), Ni(II) and Zn(II) Complexes Containing Schiff Base Ligands Towards Potential Biological Application
Mst. Sadia Afrin Dalia, Farhana Afsan, Md. Saddam Hossain, Md. Abdul Mannan, M. M. Haque, Md. Kudrat-E-Zahan
Asian Journal of Chemical Sciences · pp. 1–11 · Published 25 Jun 2018
10.9734/AJOCS/2018/42355Abstract
Some metal complexes of Zn(II), Mn(II) and Ni(II) ions with tetradentate N, O coordinating Schiff base ligand [2-bis(2-hydroxybenzylidene)}hydrazinecarboxamide], (C15H13N3O3) were synthesized. The Schiff base ligand was derived from the condensation of semicarbazide hydrochloride and salicylaldehyde. The overall reactions were monitored by TLC and UV-Visible spectral analysis. All the ligands and metal complexes were isolated from the reaction in the solid form and characterized by IR, UV-Visible, Thermal analysis, Magnetic Susceptibility, Conductivity and some physical measurements. Spectroscopic evidence indicated that the Schiff base was behaved as N, O coordinating chelating agent. Magnetic susceptibility data coupled with electronic spectra suggested that [ZnC15H11N3O3] and [MnC15H11N3O3].2H2O complexes are tetrahedral whereas [NiC15H11N3O3].H2O complex is square planar. The conductivity value indicated that all the complexes were non-electrolyte. Thermal analysis (TGA and DTG) data showed the possible degradation pathway of complexes (C12H8O2, at 200-490 0C and -NH3O-, at 400-650 0C). The Schiff bases and their metal complexes have been shown moderate to strong antimicrobial activity against some pathogenic bacteria.
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