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Three models of the iron–dioxygen bond. Pauling model: Low-spin (S = 0) FeII with singlet O2; Weiss model: Low-spin (S = 1/2) FeIII antiferromagnetically coupled to an O2•−; McClure-Goddard model (ozone model): Intermediate-spin (S = 1) FeII antiferromagnetically coupled to triplet O2. Reprinted with permission from Ref. [45]. Copyright 2013 American Chemical Society.
