Palladium(II) and Ruthenium(II) Complexes Bearing Arylsulfonate-Based Ligands: Synthesis, Structural Characterization and Catalytic Properties

Abstract

In this paper, a series of 4-aminophenyl arylsulfonates (L1–3) and their Schiff bases (L4–6) were synthesized. [Ru(p-cymene)(L1–3)Cl<inf>2</inf>] (K1–3), trans-[Pd(L4-6)<inf>2</inf>] (K4–6), and [Ru(p-cymene)(4-aminophenol)Cl<inf>2</inf>] (K7) type transition metal complexes have been prepared from the reaction of the appropriate metal salt, L1–6 and 4-aminophenol. All compounds characterized with different techniques like C, H, N analysis, NMR, IR and UV–Vis techniques. Solid-state structures of one Ru(II) complex (K1) and one Pd(II) complex (K6) have been determined by single-crystal X-ray diffraction. The complexes K1–7 have been tested as catalysts for the catalytic oxidation of benzyl alcohol to bezaldehyde in the presence of periodic acid (H<inf>5</inf>IO<inf>6</inf>). The results show that Ru(II) complexes are more active catalysts than Pd(II) catalysts for this reaction under worked conditions. © 2016 Elsevier Ltd