Synthesis, Characterization of Two New Schiff Base and Their PdII Complexes and Investigation of Palladium Catalyzed Cross-Coupling Reactions

Two Schiff base ligands, S 1 and S 2 , were synthesized from the reaction of 2-amino-5-ethyl-4-methylthiophene-3-carbonitrile with 2-hydroxybenzaldehyde and 4-nitrobenzaldehyde were investigated for their coordination to PdCl 2 (CH 3 CN) 2 . The prepared ligands S 1 and S 2 and the Pd II complexes 1 and 2 were characterized by using FTIR, 1 H, and 13 C NMR, UV-Vis, TGA, elemental analysis, molar conductivity, mass, and magnetic susceptibility. The characterization data agree well with the formulation of ligands S 1 and S 2 and complexes 1 and 2. The geometries of the metal chelate were discussed with the help of magnetic and spectroscopic measurements. Finally, the catalytic potential of the synthesized Pd II complexes for Suzuki-Miyaura and Mizoroki-Heck coupling reactions was investigated using GC-MS. As a result, it was observed that the palladium complexes are the active catalysts in suitable Suzuki-Miyaura and Mizoroki-Heck C-C coupling reactions.