1H nuclear magnetic resonance spectra of cis-dimethylbis(trimethylphosphine)platinum and some related systems

Abstract

The ¹H n.m.r. spectrum of the platinum-bonded methyl groups of cis-PtMe₂(PMe₃)₂ is shown not to be of the [AX₃]₂ spin type but to be [AR₃X₉]₂ and the complete proton spectrum is analysed on this basis. ³¹P Parameters are also given. The spectra of cis-PtMe₂L₂(L = PPh₃ and PMe₂Ph) are also considered and it is suggested that all the phenyl protons must be included in the analysis. The lack of resolved features, other than the strong doublet, in the spectrum of cis-PtCl₂(PMe₂Ph)₂ is put down to the same cause.