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Issue 45, 2016
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Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple

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Abstract

Redox-driven ion transfer between phases underpins many biological and technological processes, including industrial separation of ions. Here we investigate the electrochemical transfer of nitrate anions between oil and water phases, driven by the reduction and oxidation of cerium coordination complexes in oil phases. We find that the coordination environment around the cerium cation has a pronounced impact on the overall redox potential, particularly with regard to the number of coordinated nitrate anions. Our results suggest a new fundamental mechanism for tuning ion transfer between phases; by ‘trapping’ the migrating ion inside the coordination sphere of a redox-active complex. This presents a new route for controlling anion transfer in electrochemically-driven separation applications.

Graphical abstract: Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple

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Article information


Submitted
22 Sep 2016
Accepted
24 Oct 2016
First published
07 Nov 2016

Phys. Chem. Chem. Phys., 2016,18, 31254-31259
Article type
Paper

Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(III/IV) redox couple

R. J. Ellis, M. K. Bera, B. Reinhart and M. R. Antonio, Phys. Chem. Chem. Phys., 2016, 18, 31254
DOI: 10.1039/C6CP06528G

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