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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Nat Chem. 2013 Mar 3;5(4):293–299. doi: 10.1038/nchem.1578

Figure 1.

Figure 1

Proposed structures of water oxidation catalysts containing redox-inactive metals (M) in the OEC (left, middle) and in heterogeneous cobalt oxide water oxidation catalysts (right).12 The OEC is known to contain a Mn3M core: one major model is based on EXAFS and electron paramagnetic resonance (EPR) studies (left)41–43 and one on X-ray crystallography (middle).18,19 Bold bonds emphasize the Mn3M and Co3M cluster cores.