Abstract
Crystals of new malonate-containing uranyl complexes [UO2(C3H2O4)(Imon)(H2O)] (I) and [UO2(C3H2O4)(Meur)3] (II), where Imon is imidazolidin-2-one (ethylenecarbamide) and Meur is methyl-carbamide, have been synthesized and studied by X-ray diffraction. Both compounds crystallize in the monoclinic system with the following unit-cell parameters (at 100 K): a = 11.1147(10) A, b = 6.9900(6) A, c = 14.4934(12) A, β = 92.042(2)°, V = 1125.30(17) A3, sp. gr. P21/n, Z = 4, R1 = 0.0398 (I); a = 16.6613(5) A, b = 9.5635(3) A, c = 22.9773(6) A, β = 103.669(2)°, V = 3557.51(18) A3, sp. gr. C2/c, Z = 8, R1 = 0.0207 (II). The crystals are composed of electroneutral chains [UO2(C3H2O4)(Imon)(H2O)] and mononuclear groups [UO2(C3H2O4)(Meur)3] as the structural units belonging to the crystal-chemical groups AT11M21 and AB01M31 (A =UO22+, T11 and B01 = C3H2, M1 = Imon, H2O, or Meur), respectively, of uranyl complexes. The packing modes of the uranyl-containing complexes were analyzed by the method of molecular Voronoi—Dirichlet polyhedra.
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