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. Author manuscript; available in PMC: 2020 May 19.
Published in final edited form as: J Am Chem Soc. 2020 Feb 18;142(8):3753–3761. doi: 10.1021/jacs.9b10371

Figure 1.

Figure 1.

a) Proposed isomers S3A and S3B of the inorganic CaMn4O5(OH) core of the S3 state of the OEC. b) Representative examples of MnIV4 complexes and their corresponding spin ground states.