Synthesis and Spectral Studies of some Zn(II),Cd(II) and Hg(II) complexes with the Ligand 2-{4- Bromo phenyl azo } -4,5-diphenyl imidazole (p-BrPAI)

Abstract

A new chelate complexes of Zn(II),Cd(II) and Hg(II) have been prepared by reacting these ions with the ligand 2-{4- Bromo phenyl azo }-4,5-diphenyl imidazole (p-BrPAI) ,The  preparation of the complexes  have been  conducted after  fixing the  optimum  conditions such as pH and concentration .UV- visible spectra of these complex solutions have been studied for a range of pH and concentration which obey Lampert-Beers Law .The structures of complexes are deduced according to mole ratio method which were obtained from the spectroscopic studies of the complex solutions .The ratios of metal: ligand obtained are (1:2) for all complexes. (UV-Vis) absorption spectra of ethanolic solution  of complexes showed bathchromic shift , as compared with that of free ligand .The infrared spectra of  the chelating complexes have been studied , Depending on these results the coordination between our ligand and the metal ions takes place.

The conductivity measurements , elemental analysis ,the percentage of some metal ions were determined .Depending on these results ,we may conclude that the ligand was bidentate . Also the proposed geometrical structures of the complexes of Zn(II),  Cd(II) and Hg (II) ions are octahedral.