摘要:
The oxidation of (tmeda)Pt-II(CH3)(2) (1, tmeda = N,N,N',N'-tetramethylethylenediamine) to (tmeda)Pt-IV(OH)(OCH3)(CH3)(2) (3) by dioxygen in methanol proceeds via a two-step mechanism. The initial reaction between (tmeda)Pt(CH3)(2) and dioxygen yields a hydroperoxoplatinum(IV) intermediate, (tmeda)Pt(OOH)(OCH3)(CH3)(2) (2), which reacts with a second equivalent of (tmeda)Pt(CH3)(2) to afford the final product 3. Both 2 and 3 have been fully characterized, including X-ray crystallographic structure determinations. The effect of ligand variation on the oxidation of several dimethylplatinum (11) complexes by 2 as well as by dioxygen has been examined.