Mechanisms of oxidation–reduction reactions between platinum(IV) and platinum(II) complexes

Abstract

The reduction reactions of platinum(IV) complexes, trans-[Pt(PEt₃)₂X₄], to platinum(II) by [Pt diars₂](NO₃)₂ in the presence of sodium chloride, sodium bromide, or sodium iodide in methanol have been investigated (diars =o-phenylenebisdimethylarsine, X = Cl or Br). The kinetic behaviour of these reactions is consistent with a mechanism involving an oxidation–reduction process between the platinum(II) five-co-ordinate complex [Pt diars₂Y]⁺(Y = Cl, Br, I) and the starting platinum(IV) complex.