Abstract
An(VI) fumarates were synthesized and structurally characterized: dihydrates of the general composition [AnO2(C4H2O4)(H2O)2] (An = U, Np, Pu) and monohydrate [UO2(C4H2O4)H2O]. Dihydrates have a chain structure, the coordination polyhedron (CP) of An(VI) atoms is a distorted hexagonal bipyramid. Fumarate ions are bound to two AnO22+ cations to form four-membered metallocycles. The structure of the monohydrate is 3D one, the CP of the uranium(VI) atom is a pentagonal bipyramid. The fumarate ion is a bridging ligand coordinated to four UO22+ cations in a monodentate way. In [AnO2(C4H2O4)(H2O)2] dihydrates, actinide contraction manifests itself through a decrease in the interatomic distance in AnO2 groups and a decrease in the volume of Voronoi–Dirichlet polyhedra along the U(VI)–Np(VI)–Pu(VI) series.
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ACKNOWLEDGMENTS
X-ray diffraction experiments were carried out at the Center for the Collective Use of Physical Research Methods of the Institute of Physical Chemistry, Russian Academy of Sciences.
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Translated from Radiokhimiya, No. 1, pp. 17–22, December, 2023 https://doi.org/10.31857/S0033831123010021
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Grigoriev, M.S., Charushnikova, I.A. & Fedoseev, A.M. An(VI) Complexes with Fumaric Acid Anions. Radiochemistry 65, 15–20 (2023). https://doi.org/10.1134/S1066362223010022
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DOI: https://doi.org/10.1134/S1066362223010022