Pd(II), Pt(II), and novel Hg(II) metal complexes of N-(diphenylphosphinothioyl)-2-(4-methylpyridyl) amine chelating ligand: Synthesis, characterization, X-ray structures and catalytic activity of Pd(II) derivative in the Suzuki cross-coupling reaction

The reaction of monooxidized thioyl (4-CH₃)C₆H₃N-2-NH(P(S)Ph₂) (1) ligand with MCl₂(COD)(M = Pd, Pt) in equimolar ratio resulted in cis-[MCl₂{1-κ²S,N^py}] (M = Pd (2), Pt(3)) complexes. Also, The reaction of 1 with HgX₂ (X = Cl, I) produced cis-[HgX₂{1-κ²S,N^py }] (X = Cl(4), I(5)). Complexes 2–5 have been isolated and characterized by multinuclear NMR (¹H, ¹³C, and ³¹P) and IR spectroscopy. The molecular structures of 2, 4, and 5 were determined using single X-ray crystallography. 4 and 5 are the first structurally defined instances of this type of κ²S,N^py -bidentate ligand with Hg(II) metal complexes. The new palladium(II) complex 2 as a pre-catalyst in the Suzuki cross-coupling process was also investigated.