Schiff Base Complexes of Di(2-Pyridyl) Ketone Derivatives with Transition Metals, Synthesis and Characterization

This study focuses on the synthesis of novel Schiff bases derived from aminopyridine and ketone, followed bytheir complexation with transition metals to form coordination compounds. The structure of these complexes was evaluated.The classical method of Schiff base synthesis which involves refluxing at 70°C for 5 hours, followed by solvent removal using a rotary evaporatorwas employed in this study. In the synthesis process, di(2-pyridyl) ketone is dissolved in absolute methanol, then combined with a solution of 2-aminopyridine, followed by refluxing. Transition metal salts in methanol were added, and further refluxing occurs. After crystallization and filtration, the products were formed and subjected to characterization using solubility test, melting point, molar conductivity, elemental analysis, and FTIR spectroscopy. The compounds show varied properties, with melting points from 123°C to 298°C, and conductivity ranging from 12.4 µScm-1 to 21.2 µScm-1, indicating nonelectrolytic behaviour. Elemental analysis validates experimental accuracy. FTIR spectra reveal imine bond formation in synthesized compounds. Coordination with metals is evident in complex spectra. Notably, M-N and M-Cl absorptions suggest metal-ligand bonding.The ligands exhibit both bidentate and monodentate coordination with transition metals, leading to diverse geometries, including octahedral.