| Autor: |
Adelani PO; Department of Chemistry and Biochemistry , St. Mary's University , San Antonio , Texas 78228 , United States., Soriano JS; Department of Chemistry and Biochemistry , St. Mary's University , San Antonio , Texas 78228 , United States., Galeas BE; Department of Chemistry and Biochemistry , St. Mary's University , San Antonio , Texas 78228 , United States., Sigmon GE, Szymanowski JES, Burns PC |
| Jazyk: |
angličtina |
| Zdroj: |
Inorganic chemistry [Inorg Chem] 2019 Oct 07; Vol. 58 (19), pp. 12662-12668. Date of Electronic Publication: 2019 Sep 12. |
| DOI: |
10.1021/acs.inorgchem.9b01448 |
| Abstrakt: |
We report herein a general synthetic approach for designing uranyl coordination cages. Compounds 1 and 2 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 6 - ions that are derived from hydrofluoric acid, a macrocyclic uranyl-phosphonate discrete compound, 1 , whose cavity contains PF 6 - ions, hydronium ions, and water molecules, is obtained. When Cs + cations are used in the synthesis, a remarkable uranyl coordination nanocage, 2 , resulted. The macrocycle ( 1 ) is approximately 10.9 × 10.9 Å 2 in diameter while the nanocage ( 2 ) is approximately 15.0 × 11.3 Å 2 in diameter, as measured from the outer oxygen atoms of the uranyl centers. Both compounds are constructed from a UO 2 2+ 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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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