The complexation of urea (U) with mercury(II) and nickel(II) ions at room temperatures and 60 oC has been studied by many methods namely elemental analysis, magnetic susceptibility, conductivity measurements, infrared and thermal analysis (TG/DTG), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), and x-ray powder diffraction (XRD) method. The physical and spectral data were well explained in terms of the formation of HgCl2.4U.2H2O (1) and Ni(NO3)2.2U.2H2O (2) at room temperature, on one hand, and HgCl2.2U.2H2O (3) and on the other hand Ni(NO3)2.2U.H2O (4) at 60 oC. On the basis of the infrared spectral data and the values of stretching vibrational bands of both –C=O and –NH2 groups, the complexation of metal ions toward urea was distinguished. The enhancement of the microbial treatments against bacteria (Escherichia Coli, Staphylococcus Aureus, Bacillus subtilis and Pseudomonas aeruginosa) and fungi (Aspergillus Flavus and Candida Albicans) was assessed and a remarkable efficiency was recorded for complexes (1) and (2).
Key words: : Urea, Hg(II) , Ni(II), Biological activity, Spectroscopic studies, Thermal analysis
|
