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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dupré, Nathalie Poblet, Josep M. Mialane, Pierre López, Xavier Aparicio, Pablo A. Hasenknopf, Bernold Dolbecq, Anne Marrot, Jérôme Malacria, Max El Moll, Hani Thorimbert, Serge Lacôte, Emmanuel Riflade, Benoît Nohra, Brigitte |
| Description | Author Affiliation: El Moll H ( Institut Lavoisier de Versailles, UMR 8180, Université de Versailles Saint-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France.) |
| Abstract | The $[ε-PMo^{V}_{8}Mo^{VI}_{4}O_{36}(OH)_{4}\{Ln^{III}(H_{2}O)\}_{4}]^{5+}$ (Ln=La, Ce, Nd, Sm) polyoxocations, called $εLn_{4},$ have been synthesized at room temperature as chloride salts soluble in water, MeOH, EtOH, and DMF. Rare-earth metals can be exchanged, and $^{31}P NMR$ spectroscopic studies have allowed a comparison of the affinity of the reduced $\{ε-PMo_{12}\}$ core, thus showing that the $La^{III}$ ions have the highest affinity and that rare earths heavier than $Eu^{III}$ do not react with the ε-Keggin polyoxometalate. DFT calculations provide a deeper insight into the geometries of the systems studied, thereby giving more accurate information on those compounds that suffer from disorder in crystalline form. It has also been confirmed by the hypothetical La→Gd substitution reaction energy that Ln ions beyond Eu cannot compete with La in coordinating the surface of the ε-Keggin molybdate. Two of these clusters (Ln=La, Ce) have been tested to evidence that such systems are representative of a new efficient Lewis acid catalyst family. This is the first time that the catalytic activity of polyoxocations has been evaluated. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 50 |
| Volume Number | 17 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2011-12-09 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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