Radiochemistry

, Volume 50, Issue 5, pp 445–449 | Cite as

Crystal structure of [CH3NH3][(UO2)(H2AsO4)3]

  • E. V. Alekseev
  • S. V. Krivovichev
  • W. Depmeier
Article

Abstract

The crystal structure of a previously unknown compound [CH3NH3][(UO2)(H2AsO4)3] was solved by direct methods and refined to R1 = 0.038 for 3041 reflections with |Fhkl| >-4σ |Fhkl|. 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.

PACS numbers

61.10.Nz 61.66.Fn 

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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  • E. V. Alekseev
    • 1
    • 2
  • S. V. Krivovichev
    • 3
  • W. Depmeier
    • 2
  1. 1.Nizhni Novgorod State UniversityNizhni NovgorodRussia
  2. 2.University of KielKielGermany
  3. 3.St. Petersburg State UniversitySt. PetersburgRussia

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