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Uranyl carboxyphosphonates that incorporate Cd(II) |
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| Authors: | Andrea N. Alsobrook Wulf Depmeier |
| Affiliation: | a Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA b Department of Chemistry and Biochemistry, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA c Institut für Geowissenschaften, Universität zu Kiel, 24118 Kiel, Germany |
| Abstract: | The hydrothermal treatment of UO3, Cd(CH3CO2)2·2H2O, and triethyl phosphonoacetate results in the formation of Cd2[(UO2)6(PO3CH2CO2)3O3(OH)(H2O)2]·16H2O (CdUPAA-1), [Cd3(UO2)6(PO3CH2CO2)6(H2O)13]·6H2O (CdUPAA-2), and Cd(H2O)2[(UO2)(PO3CH2CO2)(H2O)]2 (CdUPAA-3). CdUPAA-1 adopts a cubic three-dimensional structure constructed from planar uranyl oxide clusters containing both UO7 pentagonal bipyramids and UO8 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 UO7 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. |
| Keywords: | Uranyl carboxyphosphonates Phosphonates Porous structures Metal-organic frameworks |
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