Abstract
Single crystals of previously unknown diaquadinitratouranyl dihydrate [UO2(NO3)2(H2O)2] · 2H2O (I) were obtained by evaporation of aqueous solution of [UO2(NO3)2(H2O)2] · 4H2O containing nitric acid in air at ambient temperature. The structure of the complex was studied by X-ray diffraction analysis. Crystals are monoclinic, a = 7.6820(15) A, b = 9.887(2) A, c = 7.1990(14) A, β = 105.08(3)°, space group P21/c, Z = 2, V = 527.95(18) A3. Structural units of crystal are neutral centrosymmetrical molecular complexes [UO2(NO3)2(H2O)2] and crystal water molecules united by a hydrogen bond system. Certain structural and spectral characteristics of new complex I and known diaquadinitratouranyl complexes were compared.
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