Redox-switchable carboranes for uranium capture and release.

Abstract:

:The uranyl ion (UO22+; U(VI) oxidation state) is the most common form of uranium found in terrestrial and aquatic environments and is a central component in nuclear fuel processing and waste remediation efforts. Uranyl capture from either seawater or nuclear waste has been well studied and typically relies on extremely strong chelating/binding affinities to UO22+ using chelating polymers1,2, porous inorganic3-5 or carbon-based6,7 materials, as well as homogeneous8 compounds. By contrast, the controlled release of uranyl after capture is less established and can be difficult, expensive or destructive to the initial material2,9. Here we show how harnessing the redox-switchable chelating and donating properties of an ortho-substituted closo-carborane (1,2-(Ph2PO)2-1,2-C2B10H10) cluster molecule can lead to the controlled chemical or electrochemical capture and release of UO22+ in monophasic (organic) or biphasic (organic/aqueous) model solvent systems. This is achieved by taking advantage of the increase in the ligand bite angle when the closo-carborane is reduced to the nido-carborane, resulting in C-C bond rupture and cage opening. The use of electrochemical methods for uranyl capture and release may complement existing sorbent and processing systems.

journal_name

Nature

journal_title

Nature

authors

Keener M,Hunt C,Carroll TG,Kampel V,Dobrovetsky R,Hayton TW,Ménard G

doi

10.1038/s41586-019-1926-4

subject

Has Abstract

pub_date

2020-01-01 00:00:00

pages

652-655

issue

7792

eissn

0028-0836

issn

1476-4687

pii

10.1038/s41586-019-1926-4

journal_volume

577

pub_type

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