Ion association with tetra-n-alkylammonium cations stabilizes higher-oxidation-state neptunium dioxocations

Estes, Shanna L.; Qiao, Baofu; Jin, Geng Bang

doi:10.1038/s41467-018-07982-5

Title: Ion association with tetra-n-alkylammonium cations stabilizes higher-oxidation-state neptunium dioxocations

Journal Article · Fri Jan 04 00:00:00 EST 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-07982-5· OSTI ID:1494551

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Argonne National Lab. (ANL), Argonne, IL (United States); Clemson Univ., Anderson, SC (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); 3M Corporate Research Analytical Lab., St. Paul, MN (United States)

Extended–coordination sphere interactions between dissolved metals and other ions, including electrolyte cations, are not known to perturb the electrochemical behavior of metal cations in water. Herein, we report the stabilization of higher–oxidation state Np dioxocations in aqueous chloride solutions by hydrophobic tetra-nalkylammonium (TAA⁺) cations—an effect not exerted by fully hydrated Li⁺ cations under similar conditions. Experimental and molecular dynamics simulation results indicate that TAA⁺ cations not only drive enhanced coordination of anionic Cl^– ligands to Np^V/VI but also associate with the resulting Np complexes via non-covalent interactions, which together decrease the electrode potential of the Np^VI/Np^V couple by up to 220 mV (ΔΔG = –22.2 kJ mol^–1). Understanding the solvation–dependent interplay between electrolyte cations and metal–oxo species opens an avenue for controlling the formation and redox properties of metal complexes in solution. As a result, it also provides valuable mechanistic insights into actinide separation processes that widely use quaternary ammonium cations as extractants or in room temperature ionic liquids.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1494551

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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