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(A) The dioxygen binding of the 5C [(2L)FeII] giving the 6C low-spin [(2L)FeIII(O2•−)] complex. Note that in both structures one of the pyridine arms of the MePY2 tether is coordinated to the iron center. (B) The reaction landscape observed when the fully reduced [(2L)FeII/CuI]+ complex is oxygenated in EtCN at −80 °C.
