Synthesis and Characterization of Schiff Base Ligands and Their Palladium(II) Complexes

Abstract

Abstract: This paper is concerned with the preparation and characterization of Schiff base ligands derived from the condensation of salicylaldehyde with three different diamines, namely, ethylenediamine, o-phenylenediamine, and trans-1,2-diaminocyclohexane.  The Schiff base ligands were characterized by elemental analysis, melting point, FTIR, UV-Vis, ¹H-NMR and ¹³C-NMR.  The Schiff base ligands are reacted with palladium(II) ion via direct reaction or using a template method. Identical complexes were obtained from the two methods with the same percentage yields. The formulas obtained for the complexes are PdC₁₆H₁₆N₂O₂Cl₂, [PdL¹]Cl₂; PdC₁₆H₁₆N₂O₂Br₂, [PdL¹]Br₂; PdC₁₆H₁₆N₂O₂.(BF₄)₂, [PdL¹](BF₄)₂; PdC₂₀H₁₆N₂O₂Cl₂, [PdL²Cl]Cl; PdC₂₀H₁₆N₂O₂Br₂, [PdL²]Br₂; PdC₂₀H₁₅N₂O₂.BF₄, [PdL²]BF₄; PdC₂₀H₂₂N₂O₂Cl₂, [PdL³]Cl₂; PdC₂₀H₂₂N₂O₂Br₂, [PdL³]Br₂; PdC₂₀H₂₀N₂O₂.2H₂O, [PdL³].2H₂O. The isolated compounds were characterized based on their melting points, elemental analyses, conductivity measurements, nuclear magnetic resonance, FTIR and electronic absorption spectra.