Highly Active and Robust Cp~* Iridium Complexes for Catalytic Water Oxidation

摘要

Catalytic water oxidation (eq 1) is of fundamental importance to natural and artificial photosynthesis, as well as photochemical energy storage and fuel production.rn2H_2O→~(catalyst)O_2+4H~++4e~- (1)rnFew homogeneous water oxidizing catalysts are known. Ones that contain Ru, Mn, or Ir have been reported, but high activity and stability are often lacking. A few are only active with 2e~-primary oxidants, such as oxone or OCl~-. Ones active with Ce(IV) are more significant, being more relevant to the 4 × le~- process of photosynthesis. We now describe several robust water oxidation catalysts using Ce(IV) as the primary oxidant that are the most active yet reported, achieving an initial rate of 54 turnover/min, and are active for several hours.