, Volume 52, Issue 4, pp 375–381 | Cite as

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

  • M. S. Grigor’evEmail author
  • N. N. Krot


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.

Key words

actinides(VI) perchlorates hydrates crystal structure X-ray diffraction analysis 


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  1. 1.
    Fischer, A., Z. Anorg. Allg. Chem., 2003, vol. 629, no. 6, pp. 1012–1016.CrossRefGoogle Scholar
  2. 2.
    Alcock, N.W. and Esperås, S., J. Chem. Soc., Dalton Trans., 1977, no. 9, pp. 893–895.Google Scholar
  3. 3.
    Fedoseev, A.M., Budantseva, N.A., Bessonov, A.A., et al., J. Alloys Compd., 1998, vols. 271–273, pp. 154–158.CrossRefGoogle Scholar
  4. 4.
    Krot, N.N., Bessonov, A.A., Grigor’ev, M.S., et al., Radiokhimiya, 2004, vol. 46, no. 5, pp. 389–395.Google Scholar
  5. 5.
    Ekstrom, A., Farrel, M.S., and Lawrence, J.J., J. Inorg. Nucl. Chem., 1968, vol. 30, no. 2, pp. 660–664.CrossRefGoogle Scholar
  6. 6.
    Sheldrick, G.M., SADABS, Madison, Wisconsin (USA): Bruker AXS, 2004.Google Scholar
  7. 7.
    Sheldrick, G.M., SHELXS97 and SHELXL97, Univ. of Göttingen (Germany), 1997.Google Scholar
  8. 8.
    Flack, H.D., Acta Crystallogr., Sect. A, 1983, vol. 39, no. 6, pp. 876–881.CrossRefGoogle Scholar

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© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussia

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