High-valent-iron-oxo species have been involved in numerous biological and environmental reactions and interest in tetraoxy high-valent iron anions, commonly called ferrates (e.g. ferrate(VI), FeVIO42- and ferrate(V), FeVO43-) is due to their importance in cleaner (�greener�) technology for treating water and wastewater treatment processes.  In the past few years, efforts are being made to understand the mechanism of the oxidation of inorganic (e.g. I-, SO32-, and S2O32-) and organic (e.g.  aniline, methionine and cysteine) compounds by ferrates through correlation of rates with 1-e- and 2-e- transfer reduction potentials.  The reactions of ferrates may be characterized by either   a 1-e- transfer step from Fe(VI) to Fe(V), followed by a 2-e- transfer to Fe(III) as the reduced product (FeVI ? FeV ? FeIII) or 2-e- transfer step to Fe(IV), followed by again 2 e- transfer to Fe(II) (FeVI ? FeIV ? FeII).  Oxygen atom transfer to the compounds may occur through involvement of either ferrate(V) or ferrate(IV) in the oxidations.

Oxidation of compounds by high-valent iron species: One- and two-electron transfer steps

245th National Meeting (2013)

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