Novel layered uranyl arsenates, Ag-6[(UO2)(2)(As2O7)(As4O13)] and A(6)(I)[(UO2)(2)(AsO4)(2)(As2O7)] (A(I)-Ag and Na): first observation of a linear As4O136- anion and structure type evolution

Alekseev, E. V., Krivovichev, S. V. and Depmeier, Wulf (2009) Novel layered uranyl arsenates, Ag-6[(UO2)(2)(As2O7)(As4O13)] and A(6)(I)[(UO2)(2)(AsO4)(2)(As2O7)] (A(I)-Ag and Na): first observation of a linear As4O136- anion and structure type evolution Journal of Materials Chemistry, 19 (17). pp. 2583-2587.

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Abstract

Three new layered uranyl arsenates with mixed arsenate anions have been prepared by high-temperature solid-state reactions: Ag-6[(UO2)(2)(As2O7)(As4O13)](1), Ag-6[(UO2)(2)(AsO4)(2)(As2O7)] (2), Na-6[(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.

Document Type: Article
Keywords: bond-valence parameterscrystal-structure autunite group uranium geometries
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
ISSN: 0959-9428
Projects: Future Ocean
Date Deposited: 11 Feb 2011 12:16
Last Modified: 27 Jan 2012 06:00
URI: http://eprints.uni-kiel.de/id/eprint/9263

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