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Issue 37, 2018
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Complexation of tetravalent uranium cations by the As4W40O140 cryptand

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Abstract

The complexation properties of the anionic [As4W40O140]28− macrocycle were studied towards the trapping of the 5f tetravalent uranium tetrachloride precursor. In aqueous solution, the increase of the uranium concentration (from one to six molar equivalents per [As4W40O140] unit) leads to the crystallization of three new isolated crystalline compounds, [{U22-OH)32-O)}AsW40O140]25− (1), [{U22-O)(HCOO)3}As4W40O140]25− (2) and [{U42-O)2(HCOO)4}As4W40O140]20− (3), in which two to four uranium atoms were trapped within the cryptand-like molecule. In compounds 1 and 3, the macrocycle keeps its architecture, while a rotation of the position of one {AsW9O33} sub-unit of the cryptand could be observed in compound 2. All the inclusion complexes have been characterized by single-crystal X-ray diffraction, IR spectroscopy, TGA, SEM/EDX microscopy, SAXS and ICP analyses.

Graphical abstract: Complexation of tetravalent uranium cations by the As4W40O140 cryptand

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Publication details

The article was received on 25 May 2018, accepted on 01 Jul 2018 and first published on 03 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00873F
Citation: CrystEngComm, 2018,20, 5500-5509
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    Complexation of tetravalent uranium cations by the As4W40O140 cryptand

    M. Dufaye, S. Duval, B. Hirsou, G. Stoclet and T. Loiseau, CrystEngComm, 2018, 20, 5500
    DOI: 10.1039/C8CE00873F

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