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Nitrate Complexes of Neptunium(V) with Alkali Metal Cations in the Outer Sphere

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Abstract

Nitrate complexes of pentavalent neptunium with alkali cations in the outer sphere, with composition Li[NpO2(NO3)2]·2H2O (I), Na[NpO2(NO3)2]·2H2O (II), Cs3[NpO2(NO3)2]3·H2O (III), NaRb5[NpO2(NO3)2]6·4H2O (IV) were isolated in the crystalline form and examined by the method of X-ray diffraction analysis. The cation–cation (CC) interaction of NpO2+ ions occurs in the complexes to give square (I, II) or trigonal-hexagonal (II, IV) cation networks. Np atoms in I–IV structures have a coordination environment in the form of hexagonal bipyramids the equatorial plane of which is formed by oxygen atoms of two bidentate-cyclic nitrate ions and two neighboring NpO2+ cations. The high quality of the single crystal of compound II made it possible to perform a high-precision X-ray diffraction experiment (2θmax = 120°) and study for the first time for Np compound the electron density distribution ρ(r). The IR and electronic absorption spectrum of compound II are presented.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow, 119071 Russia, 119991, Moscow, Russia

    I. A. Charushnikova, M. S. Grigor’ev, A. M. Fedoseev & A. A. Bessonov

  2. Lomonosov Moscow State University, 119991, Moscow, Russia

    K. A. Lysenko

Authors
  1. I. A. Charushnikova
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  2. M. S. Grigor’ev
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  3. A. M. Fedoseev
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  4. A. A. Bessonov
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  5. K. A. Lysenko
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Corresponding author

Correspondence to I. A. Charushnikova.

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ACKNOWLEDGMENTS

The X-ray diffraction experiments were performed at the Collective Use center “Physical methods of research” at the Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences.

FUNDING

The study was financed in part by the Ministry of Science and Higher Education of the Russian Federation (project no. AAAAA18-118040590105-4).

CONFLICT OF INTERESTS

The authors declare that they have no conflict of interest.

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Charushnikova, I.A., Grigor’ev, M.S., Fedoseev, A.M. et al. Nitrate Complexes of Neptunium(V) with Alkali Metal Cations in the Outer Sphere. Radiochemistry 62, 161–169 (2020). https://doi.org/10.1134/S1066362220020022

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  • DOI: https://doi.org/10.1134/S1066362220020022

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