Crystal Structure of (H3O)2[(UO2)2(SO4)3(H2O)] · 6.86H2O, a New Hydroxonium Diuranyltrisulfate Aqua Complex

• Published in: Russian journal of inorganic chemistry Vol. 63; no. 5; pp. 597 - 603
• Main Authors: Sveshnikova, L. B., Surazhskaya, M. D., Mikhailov, Yu. N., Churakov, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.05.2018; Springer Nature B.V
• Subjects: Atomic structure; Chemistry; Chemistry and Materials Science; Coordination Compounds; Crystal structure; Crystallography; Hydrogen bonds; Inorganic Chemistry; Molecular chains; Oxygen atoms; Single crystals; Uranium; Uranium dioxide; Water chemistry; X-ray diffraction
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023618050078

Single crystals of earlier unknown hydroxonium monoaquatrisulfatodiuranylate 6.86-hydrate (H 3 O) 2 [(UO 2 ) 2 (SO 4 ) 3 (H 2 O)] · 6.86H 2 O ( I ) have been synthesized via the evaporation of an aqueous [UO 2 (NO 3 ) 2 (H 2 O) 2 ] · n H 2 O ( n = 2, 4) solution containing sulfuric and nitric acids in air at room temperature. The structure of complex I has been studied by X-ray diffraction. Crystals are monoclinic, а = 15.0903(12) Å, b = 9.9191(8) Å, c = 15.6099(13) Å, β = 112.560(1)°, space group P 2 1 / n , Z = 4, V = 2157.7(3) Å 3 . The complex is formed due to electrostatic attraction forces between counterions and stabilized by hydrogen bonds. Its main structural element is the [(UO 2 ) 2 (SO 4 ) 3 H 2 O] n 2- framework. The structure contains two types of uranium atoms surrounded by oxygen atoms according to a pentagonal bipyramid motif. The coordination polyhedra of all the three crystallographically different S atoms are SO 4 2- tetrahedra. The U(1) atom in the equatorial bipyramid plane is monodentately bonded to the oxygen atoms of five SO 4 2- tetrahedra, while the U(2) atom is monodentately coordinated to four sulfate groups and one water molecule.