Synthesis and Characterization of Complexes of Pd(II) with Schiff base Ligand

A novel series of Pd(II) complexes with Schiff bases derived from pyridine-2-carbaldehyde and 2-aminopyrazine and 2-methylaniline have been synthesized. The metal complexes were characterized by micro elemental analysis, molar conductivity, magnetic susceptibility, FTIR, and electronic absorption spectra. The Pd (II) complexes are colored and stable in air. In the metal complexes the metal -ligand ratio found to be 1:2. The sharp band appeared at 1650-1660 cm-1 is characteristics of the azomethine group present in the Schiff base ligands. This band was shifted to lower frequency (1640 – 1645 cm-1) in all the Pd (II) complexes, which indicates the coordination of the azomethine nitrogen to metal ion in complexes. A broad band at 3400- 3650 cm-1 is present in metal complexes but absent in ligands, which indicates coordination of water molecules to the metal ion. The higher molar conductivity data of the complexes in DMF solution indicates they are electrolytic in nature. The spectral data indicate that the Schiff base ligand behaves as bidentate and coordinated with metal ion by azomethine nitrogen and pyridine nitrogen atom to the metal ion. On the basis of elemental analysis, magnetic susceptibility and electronic spectral data, geometry of complexes was proposed to be square planar in nature.