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Radiochemistry

, 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
Article

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.

Key words

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

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

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

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