Confinement Effects at the External Surface of Delaminated Zeolites (ITQ-2): An Inorganic Mimic of Cyclodextrins
| Autor: | Hermenegildo García, Avelino Corma, Belén Ferrer, Vicente Fornés, Maria S. Galletero |
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| Rok vydání: | 2003 |
| Předmět: |
biology
Chemistry Inorganic chemistry Reaction intermediate Photochemistry biology.organism_classification Surfaces Coatings and Films law.invention Adsorption Radical ion law Materials Chemistry Flash photolysis Physical and Theoretical Chemistry Zeolite Mesoporous material Electron paramagnetic resonance Corma |
| Zdroj: | The Journal of Physical Chemistry B. 107:1135-1141 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp0210531 |
| Popis: | Novel delaminated ITQ-2 zeolite has a remarkably large accessible external surface area (∼800 m2 g-1) and reduced microporosity (0.009 cm-3 g-1) and has attracted interest as an alternative to conventional zeolites or mesoporous MCM-41 (Corma, A.; Fornes, V.; Pergher, S. B.; Maesen, T. L. M.; Buglass, J. G. Nature 1998, 396, 353−356). α,ω-Diphenyl polyenes have been used as molecular probes to check the ability of ITQ-2 zeolite to generate organic radical cations. Of these probes, only t,t-1,4-diphenyl-1,3-butadiene (DPB) is transformed into a persistent reaction intermediate upon adsorption on ITQ-2. The process occurs in the “cup”-like cavities open to the exterior since selective silylation of the cups inhibits completely the generation of this reaction intermediate. Detection of 1-phenylnaphthalene as reaction product, EPR spectroscopy, and alternative laser flash photolysis generation strongly support 1-phenylnaphthalene radical cation as the intermediate formed after the adsorption of DPB onto ITQ-2... |
| Databáze: | OpenAIRE |
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