Abstract
Cu2{(UO2)3[(S,Cr)O4]5}(H2O)17 crystals were prepared by evaporation of aqueous solutions. The crystal structure was solved by the direct method and refined to R1 = 0.064 (wR2 = 0.177) for 8120 reflections with ¦Fhkl¦ ≥ 4σ ¦Fhkl¦. Rhombic system, space group Pbca, a = 18.0586(8), b = 19.9898(9), c = 20.5553(8) A, V = 7420.2(6) A3. The structure is based on {(UO2)3[(S,Cr)O4]5}4− anionic layers, formed by combination of UO7 pentagonal bipyramids and TO4 tetrahedra through common vertices. The { (UO2)3 ⋅ [(S,Cr)O4]5}4− layers are parallel to the (010) plane. The Cu2+ (H2O)6 octahedra and additional water molecules are located in the interplanar space and provide binding of the layers in the structure by hydrogen bonds. Based on the occupancy of tetrahedral positions, more accurate chemical formula of the compound should be written as Cu2{(UO2)3[(S0.804 Cr0.196)O4]5} (H2O)17.
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