Abstract
The crystal structure of a previously unknown compound [CH3NH3][(UO2)(H2AsO4)3] was solved by direct methods and refined to R 1 = 0.038 for 3041 reflections with |F hkl | >-4σ |F hkl |. The compound crystallizes in the monoclinic system, space group P21/c, a = 8.980(1), b = 21.767(2), c = 7.867(1) Å, β = 115.919(5)°, V = 1383.1(3) Å3, Z = 4. In the structure of the compound, pentagonal bipyramids of uranyl ions, sharing bridging atoms with tetrahedral [H2AsO4]− anions, form strongly corrugated layered complexes [(UO2)(H2AsO4)3]− arranged parallel to the (100) plane. The protonated methylamine molecules [CH3NH3]+ form unidimensional tapelike packings parallel to the c axis and linked by hydrophilic-hydro-phobic interactions. The topology of the layered uranyl arsenate complex [(UO2)(H2AsO4)3]− is unusual for uranyl compounds and was not observed previously. A specific feature of this topology is the presence of monodentate arsenate “branches” arranged within the layer.
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Original Russian Text © E.V. Alekseev, S.V. Krivovichev, W. Depmeier, 2008, published in Radiokhimiya, 2008, Vol. 50, No. 5, pp. 385–388.