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)](a) belonging to the crystal-chemical group AT (11) M (2) (1) (A = UO (2) (2+) , T (11) = C3H2O (4) (2-) , M (1) = Urea) of uranyl complexes. Crystals II and III are composed of the molecular complexes [UO2(L)(Urea)(3)], where L = C3H2O (4) (2-) or C2O (4) (2-) , belonging to the crystal-chemical group AB (01) M (3) (1) (A = UO (2) (2+) , B (01) = C3H2O (4) (2-) or C2O (4) (2-) , 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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