Abstract
Three new uranyl borates, K(UO2)(BO3) (1), Rb(UO2)(BO3) (2) and Cs(UO2)(BO3) (3) have been prepared using B2O3 fluxes at 1000 ºC. 1 and 3 can also be synthesized using potassium tetraborate tetrahydrate as a molten flux at 290 ºC, which provides a new low temperature route to prepare actinide borates. 1 possesses an a-uranophane anion sheet topology identical to that in the previously reported compounds Li(UO2)(BO3) and Na(UO2)(BO3). 2 and 3 display a new [UO5]1∞ anion topology with a basic building block of edge-sharing dimers comprised of (UO7)2 polyhedra. The A(UO2)(BO3) (A ¼ alkali metal) series shows a systematic structural evolution, which will be discussed in the main text.
© 2013 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
