Abstract
The hydrothermal treatment of UO 3, Cd(CH 3CO 2) 2·2H 2O, and triethyl phosphonoacetate results in the formation of Cd 2[(UO 2) 6(PO 3CH 2CO 2) 3O 3(OH)(H 2O) 2]·16H 2O (CdUPAA-1), [Cd 3(UO 2) 6(PO 3CH 2CO 2) 6(H 2O) 13]·6H 2O (CdUPAA-2), and Cd(H 2O) 2[(UO 2)(PO 3CH 2CO 2)(H 2O)] 2 (CdUPAA-3). CdUPAA-1 adopts a cubic three-dimensional structure constructed from planar uranyl oxide clusters containing both UO 7 pentagonal bipyramids and UO 8 hexagonal bipyramids that are linked by Cd(II) cations and phosphonoacetate to yield large cavities approximately 16 Å across that are filled with disordered water molecules. CdUPAA-2 forms a rhombohedral three-dimensional channel structure that is assembled from UO 7 pentagonal bipyramids that are bridged by phosphonoacetate. CdUPAA-3 is layered with the hydrated Cd(II) cations incorporated directly into the layers linking one-dimensional uranyl phosphonate substructures together. In this structure, there are complex networks of hydrogen bonds that exist within the sheets, and also stitch the sheets together.
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