Topologically identical, but geometrically isomeric layers in hydrous α-, β-Rb[UO2(AsO3OH)(AsO2(OH)2)]·H2O and anhydrous Rb[UO2(AsO3OH)(AsO2(OH)2)]

Three different layer geometries observed in the structures of Rb[UO2(AsO3OH)(AsO2(OH)2)] and α- and β- Rb[UO2(AsO3OH)(AsO2(OH)2)]·H2O. Two different coordination environments of uranium polyhedra (types I and II) are shown schematically on the top of the figure.