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Hybrid Uranyl-Phosphonate Coordination Nanocage.

08:00 EDT 12th September 2019 | BioPortfolio

Summary of "Hybrid Uranyl-Phosphonate Coordination Nanocage."

We report herein a general synthetic approach for designing uranyl coordination cages. Compounds and are constructed through a temperature-dependent and solvent-driven self-assembly. In both cases, the synthetic strategy involves in situ phosphonate ligand condensation into a flexible pyrophosphonate ligand. This pyrophosphonate ligand formation is essential for the introduction of curvature into these compounds. In the presence of PF ions that are derived from hydrofluoric acid, a macrocyclic uranyl-phosphonate discrete compound, , whose cavity contains PF ions, hydronium ions, and water molecules, is obtained. When Cs cations are used in the synthesis, a remarkable uranyl coordination nanocage, , resulted. The macrocycle () is approximately 10.9 × 10.9 Å in diameter while the nanocage () is approximately 15.0 × 11.3 Å in diameter, as measured from the outer oxygen atoms of the uranyl centers. Both compounds are constructed from a UO moiety, coordinated by an additional four oxygen atoms from the phosphonate group to form pentagonal bipyramidal geometry. All the compounds fluoresce at room temperature, showing characteristic vibronically coupled charge-transfer based emission.

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Name: Inorganic chemistry
ISSN: 1520-510X
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