Jump to main content
Jump to site search

Issue 17, 2009
Previous Article Next Article

Novel layered uranyl arsenates, Ag6[(UO2)2(As2O7)(As4O13)] and AI6[(UO2)2(AsO4)2(As2O7)] (AI–Ag and Na): first observation of a linear As4O136− anion and structure type evolution

Author affiliations

Abstract

Three new layered uranyl arsenates with mixed arsenate anions have been prepared by high-temperature solid-state reactions: Ag6[(UO2)2(As2O7)(As4O13)] (1), Ag6[(UO2)2(AsO4)2(As2O7)] (2), Na6[(UO2)2(AsO4)2(As2O7)] (3). The crystal structures of the synthesized compounds have been solved by direct methods, and found to be based upon 2-D anionic layers with complex topology. The layers have composition [(UO2)2(As2O7)(As4O13)]6− in 1 and [(UO2)2(AsO4)2(As2O7)]6− in 2 and 3. In the structure of 1, UO7 pentagonal bipyramids share corners with linear As2O74− and zigzag-like As4O136−. Compounds 2 and 3 are isostructural and based upon corner-sharing between UO7 pentagonal bipyramids, AsO43− and As2O74−groups. The A+ cations (Ag+ in 1 and 2, Na+ in 3) are in between the layers. The zigzag-like tetramer [As4O13]6− in the structure of 1 is the first example of a linear tetramer in arsenate chemistry.

Graphical abstract: Novel layered uranyl arsenates, Ag6[(UO2)2(As2O7)(As4O13)] and AI6[(UO2)2(AsO4)2(As2O7)] (AI–Ag and Na): first observation of a linear As4O136− anion and structure type evolution

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Oct 2008, accepted on 20 Nov 2008 and first published on 22 Jan 2009


Article type: Paper
DOI: 10.1039/B818757F
Citation: J. Mater. Chem., 2009,19, 2583-2587
  •   Request permissions

    Novel layered uranyl arsenates, Ag6[(UO2)2(As2O7)(As4O13)] and AI6[(UO2)2(AsO4)2(As2O7)] (AI–Ag and Na): first observation of a linear As4O136− anion and structure type evolution

    E. V. Alekseev, S. V. Krivovichev and W. Depmeier, J. Mater. Chem., 2009, 19, 2583
    DOI: 10.1039/B818757F

Search articles by author

Spotlight

Advertisements