BIS-μ-DIHALODIPLATINUM-(Pt-Pt) AND ITS HYDRIDO A -FRAME DERIVATIVES REVISITED

Article abstract of DOI:10.1016/0022-328X(86)80157-7

Definitive 1H, 31P and 195Pt NMR data are reported for the complexes (X = Cl, Br or I; dppm = Ph2PCH2PPh2), , ⁺, ⁺, ⁺, (Y = CH2, S or SO2), ⁺ and ⁺.The complexes ⁺ (X = Br or I) are reported for the first time, and evidence is presented that ⁺ has a T -frame structure (involving a donor-acceptor metal-metal bond) rather than an A -frame structure.Early preparative routes to (X = Cl, Br or I) were shown to give complexes contaminated with small amounts of X, and rapid intermolecular proton transfer between and ⁺ was observed; for X = Cl, ΔG(excit.) is 44.1 kJ mol^-1.The merits of 195Pt NMR spectroscopy for studying platinum dimers are discussed, and a correlation between ¹J(PtPt) and r(PtPt) was observed.