Synthesis and X-ray Structural Characterization of Two Unbridged Diplatinum(III) Compounds: cis- and trans-Bis[bis(1-imino-1-methoxyethane)trichloroplatinum(III)]. Transient Species in the Oxidation of Platinum(II) to Platinum(IV)

摘要

The formation of intermediate Pt~III dimmers appears to be a relatively common, although overlooked, feature of platinum chemistry. The oxidation of Pt~II to Pt~IV requires the removal of two electrons by the oxidant (an acid), assisted by a ligand (a base) entering the coordination sphere from the opposite side. A second Pt~II unit can act as a base contributing two D_z~2 electrons and binding face-to-face from the axial direction. The resulting dimmer completes the coordination sphere of the adjoined platinum unit by binding an extra ligand.