Transition metal–carbon bonds. Part XX. Methyl derivatives of platinum-(II) and -(IV) containing tertiary phosphines as ligands

Abstract

Methylplatinum(II) complexes of the types cis-PtMe₂L₂, cis-PtXMeL₂ and trans-PtXMeL₂(X = halogen; L = PMe₂Ph or PMePh₂) and methylplatinum(IV) complexes of the type PtX_4–nMe_n(PMe₂Ph)₂(X = halogen, n= 1–4) are described. The stereochemistries are derived from the methyl resonance patterns in the n.m.r. spectra and are confirmed by dipole moment and i.r. spectral measurements. Values of δ_s(Me) for the platinum-bonded methyl groups, ν(Pt–C), ν(Pt–Cl), τ(Me), J(P–H) and J(Pt–H) are given and discussed.