A new dinuclear Ru-OH2 complex has been prepared and serves as a water oxidation catalyst (see figure; O?red, N?lavender, Ru?pink). Structural and kinetic analyses, as well as reactivity tests provide compelling evidence, showing that the crucial O-O bond-formation steps occur through a bimolecular I2M mechanism. Furthermore, this bimolecular interaction is demonstrated for the first time using 18O-labeling experiments.
Ligand geometry directs O-O bond-formation pathway in ruthenium-based water oxidation catalyst
Angew. Chem. Int. Ed. 2012, 51, 5967-5970.