Radiochemistry

, Volume 53, Issue 6, pp 569–575 | Cite as

Synthesis and structural study of new potassium uranyl selenates K2(H5O2)(H3O)[(UO2)2(SeO4)4(H2O)2](H2O)4 and K3(H3O)[(UO2)2(SeO4)4(H2O)2](H2O)5

  • V. V. Gurzhiy
  • O. S. Tyumentseva
  • S. V. Krivovichev
  • I. G. Tananaev
  • B. F. Myasoedov
Article

Abstract

Single crystals of new uranyl selenates K2(H5O2)(H3O)[(UO2)2(SeO4)4(H2O)2](H2O)4 (1) and K3(H3O)[(UO2)2(SeO4)4(H2O)2](H2O)5 (2) were prepared by isothermal evaporation at room temperature. The crystal structure of 1 was solved by the direct method [C2/c, a = 17.879(5), b = 8.152(5), c = 17.872(5) Å, β = 96.943(5)°, V = 2585.7(19) Å3, Z = 4] and refined to R1 = 0.0449 (wR2 = 0.0952) for 2600 reflections with |Fo| ≥ 4σF. The structure of 2 was solved by the direct method [P21/c, a = 17.8377(5), b = 8.1478(5), c = 23.696(1) Å, β = 131.622(2)°, V = 2574.5(2) Å3, Z = 4] and refined to R1 = 0.0516 (wR2 = 0.1233) for 4075 reflections with |Fo| ≥ 4σF. The structures of 1 and 2 are based on [(UO2)2(SeO4)4(H2O)2]4− layers. The charge of the inorganic layer is compensated by potassium and oxonium ions arranged in the interlayer space. Each K ion is surrounded by seven O atoms belonging to uranyl selenate layers and water molecules, so that it binds with each other the adjacent uranyl selenate structural elements.

Keywords

potassium uranyl selenates uranium selenates single crystal X-ray diffraction 

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • V. V. Gurzhiy
    • 1
    • 2
  • O. S. Tyumentseva
    • 3
  • S. V. Krivovichev
    • 1
  • I. G. Tananaev
    • 3
  • B. F. Myasoedov
    • 3
  1. 1.Chair of Crystallography, Geological FacultySt. Petersburg State UniversitySt. PetersburgRussia
  2. 2.Chemical FacultySt. Petersburg State UniversitySt. PetersburgRussia
  3. 3.Frumkin Institute of Physical Chemistry and ElectrochemistryMoscowRussia

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