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Issue 34, 2015
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Direct evidence of Fe(V) and Fe(IV) intermediates during reduction of Fe(VI) to Fe(III): a nuclear forward scattering of synchrotron radiation approach

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Abstract

Identification of unstable high-valent iron species in electron transfer reactions of ferrate(VI) (FeVIO42−, Fe(VI)) has been an important challenge in advancing the understanding of the oxidative mechanisms of ferrates. This paper presents the first example of distinguishing various phases differing in the valence state of iron in the solid state reduction of Fe(VI) to Fe(III) oxides at 235 °C using hyperfine parameters, isomer shift and hyperfine magnetic field, obtained from nuclear forward scattering of synchrotron radiation (NFS). The NFS technique enables a fast data accumulation resulting in high time resolution of in situ experiments. The results suggest a reaction mechanism, involving Fe(V) and Fe(IV) species, in the thermal decomposition of K2FeO4 to KFeO2. The present study opens up an approach to exploring the unambiguous identification of Fe(VI), Fe(V), Fe(IV), and Fe(III) in electron-transfer reaction mechanisms of ferrates in solid and aqueous phase systems.

Graphical abstract: Direct evidence of Fe(v) and Fe(iv) intermediates during reduction of Fe(vi) to Fe(iii): a nuclear forward scattering of synchrotron radiation approach

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Publication details

The article was received on 30 Jun 2015, accepted on 29 Jul 2015 and first published on 30 Jul 2015


Article type: Communication
DOI: 10.1039/C5CP03784K
Citation: Phys. Chem. Chem. Phys., 2015,17, 21787-21790
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    Direct evidence of Fe(V) and Fe(IV) intermediates during reduction of Fe(VI) to Fe(III): a nuclear forward scattering of synchrotron radiation approach

    L. Machala, V. Procházka, M. Miglierini, V. K. Sharma, Z. Marušák, H. Wille and R. Zbořil, Phys. Chem. Chem. Phys., 2015, 17, 21787
    DOI: 10.1039/C5CP03784K

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