Synthesis and Characterization of Square-planar Palladium(II), Platinum(II) and Rhodium(I) Complexes with a Chiral Pyridylphosphine Hybrid Ligand

The complexes [PdLCl(2)] 1, [PtLCl(2)] 2, [PtL(SnCl3)Cl] 3 and [RhL(CO)Cl] 4, where 1, is the chiral pyridylphosphine 4-(diphenylphosphinomethyl)-2,2-dimethyl-5-(2-pyridyl)-1,3-dioxolane, have been synthesized and characterized by IR, NMR and FAB mass spectra. The structure of compound 1 has been solved by X-ray diffraction: the ligand is co-ordinated through both the P and N atoms to form a seven-membered ring which adopts a chair conformation. One of the hydrogen atoms of the backbone is located 272(3) Angstrom over the palladium atom in a pseudo-axial position. Spectroscopic evidence supports a chelating behaviour of the ligand also in compounds 2 and 3. The behaviour of the L ligand in the rhodium(I) species 4 is discussed.

The complexes [PdLCl,] 1, [PtLCl,] 2, [PtL(SnCI,)Cl] 3 and [RhL(CO)CI] 4, where L is the chiral pyridylphosphine 4-(diphenylphosphinomet hyl)-2,2-dimethyl-5-(2-pyridyl)1-, 3-dioxolane7 have been synthesized and characterized by IR, NMR and FAB mass spectra. The structure of compound 1 has been solved by X-ray diffraction: the ligand is co-ordinated through both the P and N atoms to form a seven-membered ring which adopts a chair conformation. One of the hydrogen atoms of the backbone is located 2.72(3) A over the palladium atom in a pseudo-axial position. Spectroscopic evidence supports a chelating behaviour of the ligand also in compounds 2 and 3. The behaviour of the L ligand in the rhodium(1) species 4 is discussed.