High Catalytic Activity of Heteropolynuclear Cyanide Complexes Containing Cobalt and Platinum Ions: Visible-Light Driven Water Oxidation

A near-stoichiometric amount of O-2 was evolved as observed in the visible-light irradiation of an aqueous buffer (pH 8) containing [Ru-II(2,2'-bipyridine)(3)] as a photosensitizer, Na2S2O8 as a sacrificial electron acceptor, and a heteropolynuclear cyanide complex as a water-oxidation catalyst. The heteropolynuclear cyanide complexes exhibited higher catalytic activity than a polynuclear cyanide complex containing only Co-III or Pt-IV ions as C-bound metal ions. The origin of the synergistic effect between Co and Pt ions is discussed in relation to electronic and local atomic structures of the complexes.