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de Miguel, M., Ragon, F., Devic, T., Serre, C., Horcajada, P. & Garcia, H. (2012) Evidence of Photoinduced Charge Separation in the Metal-Organic Framework MIL-125(Ti)-NH2. CHEMPHYSCHEM, 13 3651–3654.
Added by: Richard Baschera (2017-03-01 08:48:22) |
| Type de référence: Article DOI: {10.1002/cphc.201200411} Numéro d'identification (ISBN etc.): {1439-4235} Clé BibTeX: deMiguel{2012} Voir tous les détails bibliographiques  |
Catégories: HORSIMN Créateurs: Devic, Garcia, Horcajada, de Miguel, Ragon, Serre Collection: {CHEMPHYSCHEM} |
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| Résumé |
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{Herein, we describe the photochemical behavior of the porous metalorganic framework MIL-125(Ti)-NH2, built up from cyclic Ti8O8(OH)(4) oxoclusters and 2-aminoterephthalate ligands. While MIL-125(Ti)-NH2 does not emit upon excitation at 420 nm, laser flash photolyses of dry samples (diffuse reflectance) or aqueous suspensions (transmission) of the solid have allowed detecting a transient characterized by a continuous absorption from 390 to 820 nm decaying in the sub-millisecond timescale, which is quenched by oxygen. This transient has been attributed to the charge-separation state. Firm evidence for this assignment was obtained by lamp irradiation of aqueous suspensions of MIL-125(Ti)-NH2 in the presence of electron-donor (N,N,N'N'-tetramethyl-p-phenylenediamine) or electron-acceptor (methylviologen) probe molecules, which has allowed the visual detection of the corresponding radical ions, in agreement with the occurrence of photoinduced charge separation in MIL-125(Ti)-NH2.}
Added by: Richard Baschera |