Structure of complexes of uranyl succinate with carbamide and dimethylurea |
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| Authors: | L B Serezhkina M S Grigor’ev N V Seliverstova V N Serezhkin |
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| Institution: | 1.Samara National Research University,Samara,Russia;2.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Three new succinate-containing complexes of uranyl with carbamide (Urea) and N,N'-dimethylurea (s-Dmur) are synthesized and studied by IR spectroscopy and X-ray diffraction. Structures of the same type, UO2(Urea)4(H2O)](UO2)2(C4H4O4)3] · 3H2О and UO2(Urea)4(H2O)](UO2)2(C4H4O4)3] · 2Urea contain two sorts of uranium-containing complex groups, namely, mononuclear UO2(Urea)4(H2O)]2+ cations and two-dimensional (UO2)2(C4H4O4)3]2– anions described by crystal-chemical formulas AМ 5 1 and A 2 Q 3 02, respectively (A = UO2 2+, M 1 = Urea or H2O, Q 02 = C4H4O4 2-), and differ only in the nature of noncoordinated molecules—water and carbamide. The main structural groups of the (UO2)2(C4H4O4)2(s-Dmur)3] crystals are (UO2)2(C4H4O4)2(s-Dmur)3] chains belonging to the А 2 Q 2 02 M 3 1 (A = UO2 2+, Q 02 = C4H4O4 2-, M 1 = s-Dmur) crystal-chemical group. Specific features of intermolecular interactions in the crystal structures are revealed using the Voronoi–Dirichlet method of molecular polyhedra. |
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