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Titolo:
Complexes of rare earths and dipicolinato ions encapsulated in X- and Y-zeolites: Luminescence properties
Autore:
Dexpert-Ghys, J; Picard, C; Taurines, A;
Indirizzi:
CNRS, CEMES, F-31055 Toulouse 4, France CNRS Toulouse France 4CNRS, CEMES, F-31055 Toulouse 4, France Univ Toulouse 3, LSPCMIB, CNRS, UMR 5068, F-31062 Toulouse, France Univ Toulouse 3 Toulouse France F-31062 R 5068, F-31062 Toulouse, France
Titolo Testata:
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
fascicolo: 3-4, volume: 39, anno: 2001,
pagine: 261 - 267
SICI:
1388-3127(200104)39:3-4<261:COREAD>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
FAUJASITIC ZEOLITES; RAMAN-SPECTRA; CATIONS; NMR; NAY; DIFFRACTION; LOCATION; METAL; ACID;
Keywords:
rare earth; lanthanide; zeolite; host-guest; luminescence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Dexpert-Ghys, J CNRS, CEMES, 29 Rue J Marvig,BP 4347, F-31055 Toulouse 4, France CNRS 29 Rue J Marvig,BP 4347 Toulouse France 4 4, France
Citazione:
J. Dexpert-Ghys et al., "Complexes of rare earths and dipicolinato ions encapsulated in X- and Y-zeolites: Luminescence properties", J INCL P MA, 39(3-4), 2001, pp. 261-267

Abstract

The complexes {Ln(DP)}Z where Ln(3+) = La3+ or Eu3+, DP is the dipicolinate ion (2,6)-pyridine dicarboxylate: C5H3N(COO-)(2) and Z = one of the faujasite-type X or Y zeolites have been synthesized and investigated by XRD, Raman and IR spectroscopy, and Eu3+ luminescence spectroscopy. The rare earthcomplexes are synthesized inside the super-cages of the zeolites; the degree of complexation never exceeds 1DP/1Ln. Only the Ln ions, which are in the super-cages, may be complexed. Luminescent europium complexes encapsulated in zeolite matrices were obtained. The D-5(0) --> F-J luminescence observed under excitation into the lowest-energy ligand-centered absorption band (275 nm) indicates that a DP to Eu energy transfer occurs in these systems. The complex versus the zeolite framework conformations influence the europium emission characteristics: the transfer is more efficient when the complexed europium [Eu(DP)](+) is directly bonded to the framework oxygen atoms rather than to a residual water molecule.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 12:23:15