Abstract
Two new uranyl complexes are synthesized: [Co(H2O)6][UO2(Mac)3]2·8H2O (I) and {Ca(H2O)2[UO2(Mac)3]2} (II) (Mac is methacrylate ion CH2C(CH3)COO~-). The crystals of complexes I and II are studied by the X-ray diffraction method (CIF files CCDC nos. 2124087 (I) and 2124088 (II)) and IR spectroscopy. The uranyl-containing structural units of the crystals of compounds I and II are mononuclear complexes [UO2(Mac)3]~- with the crystal chemical formula AB3~(01) (A= UO2~(2+), B~(01) = Mac). In the crystals of complex I, the [UO2(Mac)3]~- complexes coexist with octahedral aqua complexes [Co(H2O)6]~(2+) and outer-sphere water molecules. In the crystals of complex II, each calcium ion binds two water molecules and two [UO2(Mac)3]~- anions to form trinuclear electroneutral complexes {Ca(H2O)2(UO2)2(Mac)6} with the crystal chemical formula A'M2~1B2~(01)B4~(11) (A = Ca~(2+), A = UO2~(2+), B~(01) and B~(11) = Mac, M~1 = H2O). In compound II, the uranium-containing complexes are joined into a 3D framework through intermolecular contacts, which are characterized using the method of molecular Voronoi-Dirichlet polyhedra.
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