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Synthesis and single crystal X-ray diffraction study of U(VI), Np(VI), and Pu(VI) perchlorate hydrates

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Abstract

The compounds [AnO2(H2O)5](ClO4)2 (An = Np, Pu) and [NpO2(ClO4)2(H2O)3] were prepared as single crystals, which were studied by X-ray diffraction at 100 K. The structural type at room temperature was determined. The low-temperature modification of [UO2(H2O)5](ClO4)2 was found and structurally studied. The coordination polyhedra in [AnO2(H2O)5]2+ are weakly distorted pentagonal bipyramids with averaged interatomic distances An-O of 1.754, 1.744, and 1.732 Å in the “yl” groups and of 2.415, 2.416, and 2.409 Å in the equatorial planes for U, Np, and Pu, respectively. Hence, in the complex cations [AnO2(H2O)5]2+ the actinide contraction is manifested only in regular shortening of the An-O interatomic distances in the “yl” groups. The compound [NpO2(ClO4)2(H2O)3], isostructural to its known uranyl analog, appeared to be the first, proved by single crystal X-ray diffraction, example of a compound with coordination interaction between the perchlorate ion and the neptunyl(VI) cation.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, block 4, Moscow, 119991, Russia

    M. S. Grigor’ev & N. N. Krot

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  1. M. S. Grigor’ev
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  2. N. N. Krot
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Correspondence to M. S. Grigor’ev.

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Original Russian Text © M.S. Grigor’ev, N.N. Krot, 2010, published in Radiokhimiya, 2010, Vol. 52, No. 4, pp. 318–323.

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Grigor’ev, M.S., Krot, N.N. Synthesis and single crystal X-ray diffraction study of U(VI), Np(VI), and Pu(VI) perchlorate hydrates. Radiochemistry 52, 375–381 (2010). https://doi.org/10.1134/S1066362210040090

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  • DOI: https://doi.org/10.1134/S1066362210040090

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