Multimode coordination chemistry of (R2P X CHnP Y R'2)(super 2-n)1- ligands (X, Y = O, S, Se; n = 1, 2). Synthesis and P-31 NMR spectroscopy of platinum complexes

The reactions of the bis(phosphine chalcogenides) CH2(PXR2)(PYR'2), where X and Y = O, S and Se, and their anions (CHPXR2)(PYR'2)1- with chloroplatinum complexes (PtCl4)2-, Pt2Cl4(PEt3)2 or (Pt2Cl2 PEt3 4)2+ produce coordination complexes. These exhibit at least five different coordination modes. The neutral ligands and the anionic ligands with X = Y = S show an X,Y coordination. The anions in a strained four-member ring exhibit a C,X coordination. A monodentate C coordination of the anions and a complex C,S bridging mode involving a dianionic ligand and two metal centers were also exhibited.