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Synthesis and crystal structure of An(VI) complexes with cyclobutanecarboxylic acid anions, [AnO2(C4H7COO)2(H2O)2] (An = U, Np) and [AnO2(C4H7COO)2(H2O)] (An = Np, Pu)

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Abstract

New complexes of hexavalent actinides with cyclobutanecarboxylic acid (Hcbc) anions, dihydrates [AnO2(cbc)2(H2O)2] [An = U (I) or Np (II)] and monohydrates [AnO2(cbc)2(H2O)] [An = Np (III) or Pu (IV)], were synthesized and studied by single crystal X-ray diffraction. The crystal structure of dihydrates I and II consists of discrete complexes. The coordination polyhedron (CP) of An(VI) in the dihydrates is a distorted hexagonal bipyramid with oxygen atoms of two C4H7COO– anions coordinated in the bidentate chelate fashion and two water molecules in the equatorial plane and two oxygen atoms of AnO2 2+ cations in the apical positions. The geometry of the An(VI) CP is influenced by Ow–H···Ocbc hydrogen bonding. Monohydrates III and IV have a chain structure. The CP of An(VI) is a pentagonal bipyramid with oxygen atoms of three C4H7COO– anions and one water molecule in the equatorial plane. Two crystallographically independent C4H7COO–anions are coordinated in different fashions: one in the bidentate chelate fashion and the other, in the bidentate bridging fashion, linking the AnO2 2+ cations into electrically neutral chains oriented along the [010] direction in the crystal. The structure of the chain is strongly influenced by hydrogen bonding.

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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

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

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  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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Correspondence to I. A. Charushnikova.

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Original Russian Text © I.A. Charushnikova, M.S. Grigor’ev, A.M. Fedoseev, 2017, published in Radiokhimiya, 2017, Vol. 59, No. 5, pp. 385–392.

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Charushnikova, I.A., Grigor’ev, M.S. & Fedoseev, A.M. Synthesis and crystal structure of An(VI) complexes with cyclobutanecarboxylic acid anions, [AnO2(C4H7COO)2(H2O)2] (An = U, Np) and [AnO2(C4H7COO)2(H2O)] (An = Np, Pu). Radiochemistry 59, 439–447 (2017). https://doi.org/10.1134/S1066362217050010

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  • DOI: https://doi.org/10.1134/S1066362217050010

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