Synthesis Spectroscopic Study of Some Lanthanide Complexes with the New Antipyrine –Azo Ligands

Azo compounds are among the most profoundly explored classes of organic reagent both from the theoretical and practical view point. The presence of an azo linkage in aromatic compounds makes them highly important in dye- stuff industry, pharmacy and analytical chemistry. In the present work we prepared two new azo ligands (L1-L2) and characterized by I.R and UV-Vis spectra. The ligands L1 also were characterized by Gc/ mass spectra. Several new complexes of Y(III), La(III), C (III), Nd(III), Eu(III), Tb(III) with new azo ligands (L1-L2) were also prepared . The structure of these complexes were deduced according to the molar ratio and Job methods, which were obtained from the spectroscopic studies of the complex solutions of the above ions. However, ratios of 1 : 3 , metal : ligand were obtained . The percentage of the metals in the complexes have been measured by I.C.P technique . Micro elemental analysis C.H.N for some of these complexes were also deduced. Percentage of chloride, nitrate and sulphate ion have also been found by using Mohr method and Spectrophotometric method Conductivity measurements have shown non-ionic character for solution of Ce(III) complexes with all the ligands in ethanol and DMF, while Y (III) , La (III), Nd (III) , Eu (III) , Tb(III) complex solution gave indication of (1:2) ionic character with all ligands. The magnetic susceptibility measurements for all Y (III) , La (III) complexes exhibit diamagnetic behavior , while paramagnetic properties were recorded for all other complexes.