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

Author(s) Ellis, R.J.; Bera, M.K.; Reinhart, B.; Antonio, M.R.
Journal Phys Chem Chem Phys
Date Published 2016 Nov 16
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.

DOI 10.1039/c6cp06528g
ISSN 1463-9084
Citation Ellis RJ, Bera MK, Reinhart B, Antonio MR. Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple. Phys Chem Chem Phys. 2016;18(45):31254-31259.

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