Abstract
Two new malonate-containing uranyl complexes with carbamide of the formulas [UO2(C3H2O4)(Urea)2] (I) and [UO2(C3H2O4)(Urea)3] (II), where Urea is carbamide, and one uranyl oxalate complex of the formula [UO2(C2O4)(Urea)3] (III) were synthesized, and their crystals were studied by X-ray diffraction. The main structural units in crystals I are the electroneutral chains [UO2(C3H2O4)(Urea)2]∞ belonging to the crystal-chemical group AT 11 M 12 (A = UO 2+2 , T 11 = C3H2O 2-4 , M 1 = Urea) of uranyl complexes. Crystals II and III are composed of the molecular complexes [UO2(L)(Urea)3], where L = C3H2O 2-4 or C2O 2-4 , belonging to the crystal-chemical group AB 01 M 13 (A = UO 2+2 , B 01 = C3H2O 2-4 or C2O 2-4 , M 1 = Urea). The characteristic features of the packing of the uranium-containing complexes are discussed in terms of molecular Voronoi–Dirichlet polyhedra. The effect of the Urea: U ratio on the structure of uranium-containing structural units is considered.
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Original Russian Text © Ya.A. Medvedkov, L.B. Serezhkina, M.S. Grigor’ev, V.N. Serezhkin, 2016, published in Kristallografiya, 2016, Vol. 61, No. 3, pp. 388–395.
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Medvedkov, Y.A., Serezhkina, L.B., Grigor’ev, M.S. et al. Synthesis and X-ray diffraction study of new uranyl malonate and oxalate complexes with carbamide. Crystallogr. Rep. 61, 383–390 (2016). https://doi.org/10.1134/S1063774516030184
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DOI: https://doi.org/10.1134/S1063774516030184