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Comparison of the free energies for the one-electron reduction of NO/O2 by FeII (middle) and for the formation of a FeIII-NO/O2 complex (right) for a resting facial triad and for substrate-bound IPNS. Sulfur donation stabilizes formation of an FeIII-O2− complex by 25.9 kcal/mol relative to a resting facial triad. Adapted from ref 36.
