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  • Title: Effect of electron availability on selectivity of O2 reduction by synthetic monometallic Fe porphyrins.
    Author: Collman JP, Shiryaeva IM, Boulatov R.
    Journal: Inorg Chem; 2003 Aug 11; 42(16):4807-9. PubMed ID: 12895101.
    Abstract:
    Herein we report that biomimetic analogues of cytochrome c oxidase (CcO) couple reduction of O(2) to oxidation of a single-electron carrier, Ru(NH(3))(6)(2+), under steady-state catalytic turnover. Higher Ru(II) concentrations favor the 4-electron vs 2-electron O(2) reduction pathway. Our data indicate that the capacity of electrode-adsorbed Fe-only porphyrins to catalyze reduction of O(2) to H(2)O is due to high availability of electrons and is eliminated under the biologically relevant slow electron delivery.
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