ChemInform Abstract: Reactions of Some Mixed-Valence Diphosphorus Compounds with the Platinum(0) Complex, (C2H4)Pt(PPh3)2. X-Ray Crystal Structure of the Product of the Reaction of (C2H4)Pt(PPh3)2 with a λ3Pλ4P+ Diphosphorus Compound.

Abstract

Abstract The reaction of (C2H4)Pt(PPh3)2(4), with the ionic N,N′-dimethylurea-bridged λ3Pλ4P+ diphosphorus compound, 1b, furnished the mononuclear platinum(II) complex, 6, whose structure was determined by X-ray diffraction. The geometry at platinum shows significant deviation from planarity. The ionic diphosphorus compound, 3a, reacted with 4 to give a PPtPPt four-membered ring system, 7. By contrast, the reaction between the covalent mixed-valence λ3Pλ5P diphosphorus compound, 2, and 4 proceeded without oxidation of the platinum centre. The 31P and 195Pt NMR parameters of 6 were ascertained by iterative analysis. The signs of the coupling constants were determined by a twodimensional 31P,31P1H-COSY-45 experiment. The NMR investigation of 7 is also described. The 1J(Pt,P) coupling constants within the ring are compared with those of similar compounds.