Synthesis and characterization of N, N’-Bis-(3-Methoxysalicyl)-P-Phenylenediiminato Copper (II) Complex Compound

Abstract

N,N’-bis(3-methoxysalicyl)-p-phenylenediimine Schiff base was prepared from the interaction of ethanolic solution of 3-methoxysalicylaldehyde and p-phenylenediamine. The Cu (II) Schiff base complex was synthesized from aqueous solutions of CuCl₂.2H_{2O and ethanolic solution of N, N’-bis(3-methoxysalicyl)-p-phenylenediimine. The Cu (II) Schiff base complex decomposed at 280^oC. The ligand is soluble in most common organic solvents except nitro benzene. The Cu (II) Schiff base complex is insoluble in most solvents except DMF and DMSO. The molar conductance value of Cu (II) Schiff base complex is 7.8 ohm-cm²mol^-1. The empirical formula of the metal Schiff base compound determined is [CuL].2H2O. The spectral data of the ligand and its Cu (II) complex compound were used to characterize the complex. The dissociation constant of the Schiff base (pKa) determined is 10.23. The stability constant of Cu (II) Schiff base complex was found to be 3.55 x 106.}

_{Keywords: Schiff base, 3-methoxysalicylaldehyde, p-phenylenediamine, Stability constant.}