Abstract
Electron transfer between [FeIII(L2)]+ and sulphur(IV) has been proposed to proceed via an inner-sphere mechanism involving formation of a transient hydrogen-bonded intermediate between the acidic proton of SO2 · xH2O/HSO3 − and the oximato oxygen of the coordinated ligand, providing the ready availability of the proton for the reduced complex. In the case of SO3 2−, this is not possible and the reaction is believed to proceed via an outer-sphere scheme.
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Ali, M., Saha, B. Kinetic studies on the electron transfer between sulphur(IV) and an iron(III) oxime–imine complex. Transition Metal Chemistry 27, 874–876 (2002). https://doi.org/10.1023/A:1021377609697
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DOI: https://doi.org/10.1023/A:1021377609697