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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†‡
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+
![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](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B818757F&imageInfo.ImageIdentifier.Year=2009)
- This article is part of the themed collection: Layered materials: structure and properties
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