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Synthesis, Characterization, Theoretical Studies and Biological Activities of Naringin Metal Complexes

Rehab Abdulmahdi Al-Hassani, Olfata Nife and Ayad T. Mahmood

The new metal complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II) and Zn(II) with naringin (L) were synthesized and characterized by elemental and thermal analyses as well as FT-IR and UV-Vis spectra. The magnetic properties and electrical conductivities of metal complexes were also determined. The nature of the complexes formed in ethanol was studied following the mole ratio method. The work also include a theoretical treatment of the formed complexes in the gas phase. This was done using the (hyperchem-8) program for the molecular mechanics and semi-empirical calculations. The heat of formation (ΔHf○), binding energy (ΔEb) and total energy (ΔET) for ligand and its complexes were calculated by (PM3) method at 298 K. The electrostatic potential of the free ligand (L) was calculated to investigate the reactive sites of the molecules. PM3 was used to evaluate the bond length, vibrational and electronic spectra for the ligand (L) and their metal complexes and compared with the experimental values. The theoretical results agreed with those found experimentally. The antibacterial activity for the (L) and its metal complexes were studied against two types of pathogenic bacteriamicroorganisms Escherichia coli and Staphylococcus aureus. Furthermore, the antifungal activity against two micro-organisms Candida albicans and Aspergillusflavus were studied for (L) ligand and its metal complexes.