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Synthesis and Structure of Mixed Cromate–Nitrate Complexes of Hexavalent Actinides, [(CH3)4N][(AnO2)(CrO4)(NO3)] (An = U, Np, Pu)

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Abstract

Mixed-anion compounds of the general composition [(CH3)4N][(AnO2)(CrO4)(NO3)], where An = U, Np, and Pu, were synthesized and structurally characterized. The structural motif of these compounds is based on anionic ribbons of the composition [AnO2(NO3)(CrO4)]nn–, consisting of seven-vertex An polyhedra linked via oppositely oriented CrO4 tetrahedra and NO3 groups acting in the An polyhedra as terminal bidentate ligands. Every four anionic ribbons form channels oriented along b-axis. Tetramethylammonium cations linked with the O atoms of the ribbons by hydrogen bonds are located in these channels. Actinide contraction is observed in the series U–Np–Pu. It is manifested in a regular decrease in the interatomic distances in the An polyhedra, in parameters b and c, and in the unit cell volume.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, korp. 4, Moscow, 119071, Russia

    A. G. Ivanova, M. S. Grigor’ev & A. M. Fedoseev

  2. Shubnikov Institute of Crystallography, Federal Research Center for Crystallography and Photonics, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    A. G. Ivanova

Authors
  1. A. G. Ivanova
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  2. M. S. Grigor’ev
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  3. A. M. Fedoseev
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Correspondence to A. G. Ivanova.

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Original Russian Text © A.G. Ivanova, M.S. Grigor’ev, A.M. Fedoseev, 2018, published in Radiokhimiya, 2018, Vol. 60, No. 2, pp. 135–137.

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Ivanova, A.G., Grigor’ev, M.S. & Fedoseev, A.M. Synthesis and Structure of Mixed Cromate–Nitrate Complexes of Hexavalent Actinides, [(CH3)4N][(AnO2)(CrO4)(NO3)] (An = U, Np, Pu). Radiochemistry 60, 148–151 (2018). https://doi.org/10.1134/S1066362218020030

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  • DOI: https://doi.org/10.1134/S1066362218020030

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