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Electrochemical Behavior of α1/α2-[Fe(H2O)P2W17O61]7– Isomers in Solution: Experimental and DFT Studies

Vilà, Neus, Aparicio Sanchez, Pablo, Sécheresse, Francis, Poblet, Josep M., López, Xavier and Mbomekallé, Israël M. 2012. Electrochemical Behavior of α1/α2-[Fe(H2O)P2W17O61]7– Isomers in Solution: Experimental and DFT Studies. Inorganic Chemistry 51 (11) , pp. 6129-6138. 10.1021/ic300090f

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Abstract

The unusual redox behavior displayed by the two isomers of the Wells–Dawson phosphotungstate anion [Fe(H2O)P2W17O61]7– is presented. The electrochemical measurements have been performed in aqueous media at different pH values from 0.5 up to 8.0. The cyclic voltammetry has also been carried out in organic media to get additional experimental data to establish the effect of the protonation on the redox properties of both isomers. At high pH values (pH ≥ 6) or in an organic medium, the reduction of the Fe center is easier in the case of the alpha-1 isomer, whereas for the alpha-2 isomer such reduction takes place at more negative potentials, as expected. In contrast, at lower pH values (pH ≤ 5), an inversion of this trend is observed, and the reduction of the Fe center becomes easier for the alpha-2 isomer compared to the alpha-1. We were able to highlight the influence of the pH and the pKa of the electrolyte on POM-based redox potentials given the pKa of the latter. A complementary theoretical study has also been performed to explain the experimental data obtained. In this sense, the results obtained from the DFT study are in good agreement with the experimental data mentioned above and have provided additional information for the electrochemical behavior of both isomers according to their different molecular orbital energies. We have also shown the influence of protonation state of the iron derivative on the relative reduction potentials of both isomers.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
ISSN: 0020-1669
Last Modified: 04 Jun 2017 09:35
URI: http://orca-mwe.cf.ac.uk/id/eprint/97297

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