Synthesis and reactions of platinum(IV) complexes with sodium ascorbate

The platinum(IV) complexes [PtCl2(OH)2(N∩N)] (N∩N=en, N,N-dmen, N,N′-dmen) were prepared by oxidation of [PtCl2(N∩N)] with hydrogen peroxide. The complexes were characterized by multinuclear NMR and infrared spectroscopy, as well as microanalysis. The reactions of these compounds with sodium ascorbate were monitored spectroscopically. Reduction of the platinum(IV) complexes by sodium ascorbate occurred only slowly. An oxalatoplatinum(IV) complex [Pt(C2O4)Cl(OH)(N,N-dmen)]·H2O was isolated from the reaction of [PtCl2(OH)2(N,N-dmen)] and sodium ascorbate and characterized by an X-ray diffraction study.