Metal complexes that support two-electron redox processes are attracting a great deal of interest because of their importance in the domain of catalysis and energy conversion. Recent developments in this field have witnessed the advent of binuclear complexes and their use for the photocatalytic splitting of HX molecules.1 While such complexes usually contain two noble metals, the Gabba� group has recently shown that heterobimetallic compounds containing a noble metal (Pt) as well as a heavy main group element (Te) may also have a potential in this area.2 As part of our developing passion in redox-active main group/transition metal platforms for energy applications, we have investigated platinum/antimony complexes of general formula R4Sb-[Pt]-Cl with [Pt] = L2Pt.  Such complexes can be oxidized by addition of an equivalent of chlorine to afford complexes of general formula (R4Sb-[Pt]-Cl3. Remarkably, some of these oxidized complexes can be reduced back to the original complex when irradiated with UV-light in the presence of a radical trap such as 2,3-dimethyl-1,3-butadiene. Depending on the antimony substituents, the quantum yield of the photoreductive elimination can be as high as 15.3 %.

Two-electron redox chemistry at the dinuclear core of a SbPt platform: Chlorine photoreductive elimination

247th National Meeting (2014)

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