Synthesis, Characterization and Chromogenic Properties of Lead (II) Complexes Containing Hydrazonic Ligands

The hydrazine and hydrazide compounds were subjected to condensation reaction with ketone and different aldehyde derivatives affording the corresponding expected hydrazones.Tow hydrazone ligands, namely, 4-hydroxy-(2-hydroxy-3-methoxybenzylidene)benzohydrazide(L1) and 4-hydroxy-(2-hydroxy-4-methoxybenzylidene) benzohydrazide(L2) were synthesized and characterized. The complexationof these ligands with Pb2+ was also investigatedand characterized. The chemical structures were found to be consistent with both analytical and spectroscopic data (CHN, FTIR, UV/Vis, TGA, 1H NMR and 13C NMR). The stoichiomtric ratio of their complexes with Pb2+ was found to be 1:1 for (L1-Pb2+) and (L2-Pb2+). The chromogenic properties of the ligands upon their complexation with Pb2+ was carried out in different solvents including methanol, ethanol, acetone, acetonitrile, dimethylsulphoxide, and tetrahydrofuran. DMSO was found to be the best solvent forthe complexation