[Pt2Cl2(μ2-O2)2([9]aneN3)2]Cl2: A Novel Platinum(IV) Dimer with Two Bridging Peroxo Ligands that Provides Insight into the Mechanism of Aerial Oxidation of Platinum(II)

[Pt2Cl2(μ2-O2)2([9]aneN3)2]Cl2·4H2O, formed by reaction of cis-[PtCl2(dmso)2] (dmso = dimethyl sulfoxide) and 1,4,7-triazacyclononane ([9]aneN3) under aerobic conditions in wet ethanol solution, is the first structurally characterized Pt(IV) complex where two metal centers are bridged by two (μ2) peroxo ligands and only the second such transition metal complex.