The oxygen-evolving centre in the protein complex photosystem II involves Ca2+ within a high-valent oxomanganese cluster, but the role of Ca2+ has yet to be clarified. Interestingly, the electron-transfer behaviour of a non-haem oxoiron(IV) complex has now been found to be significantly altered by Lewis acid metal-ion binding to the oxo atom.
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Karlin, K. Redox control of oxoiron(IV). Nature Chem 2, 711–712 (2010). https://doi.org/10.1038/nchem.813
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DOI: https://doi.org/10.1038/nchem.813
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