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Modification of the luminescence properties of an Europium(III) Tris(β-diketonate) Complex by Inclusion in γ-cyclodextrin and 2,3,6-trimethyl-γ-cyclodextrin

  • José A. Fernandes
  • Susana S. Braga
  • Rute A. Sá Ferreira
  • Martyn Pillinger
  • Luís D. Carlos
  • Paulo Ribeiro-Claro
  • Isabel S. Gonçalves
Article

Abstract

A 1:1 inclusion compound between octakis(2,3,6-tri-O-methyl)-γ-cyclodextrin (TRIMEG) and the chelate complex Eu(NTA)3·2H2O (NTA=1-(2-naphthoyl)-3,3,3-trifluoroacetonate) was prepared and characterized by powder X-ray diffraction, thermogravimetric analysis and photoluminescence spectroscopy. The results were compared with those obtained for the corresponding native γ-CD adduct. Excitation and emission spectra were measured, and the lifetimes were determined for the Eu3+ first excited state (5D0). The results indicate the presence of only one low-symmetry environment for the Eu3+ cations in the inclusion compounds. Encapsulation of the Europium complex in the two CDs increases the quantum efficiency of the ligand-to-metal energy transfer pathway, but the efficiency of the Eu3+ sensitization was significantly higher with TRIMEG as the host molecule. This may be related with the observation that the two hosts appear to have different influences on the Eu3+ coordination environments for the guest molecule.

Keywords

cyclodextrins β-diketonate Europium inclusion compounds luminescence TRIMEG 

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Notes

Acknowledgements

This work was partly funded by the FCT, POCTI and FEDER (Project POCTI/CTM/46780/2002). JAF and SSB thank the FCT for grants.

References

  1. 1.
    (a) B. Whittaker: Nature 228, 157 (1970); (b) L.C. Thompson: In K.A. Gschneider and L. Eyring (eds.), Handbook on the Physics and Chemistry of Rare Earths, Vol. 3, Chapter 25, North-Holland, Amsterdam (1979); (c) W. DeW. Horrocks and M. Albin: Prog. Inorg. Chem. 31, 1 (1984); (d) G.F. de Sá, O.L. Malta, C. de Mello Donegá, A.M. Simas, R.L. Longo, P.A. Santa-Cruz, and E.F. da Silva: Coord. Chem. Rev. 196, 165 (2000); (e) K.C. Joshi and V.N. Pathak, Coord. Chem. Rev. 22, 37 (1977)Google Scholar
  2. 2.
    A. Døssing: Eur. J. Inorg. Chem. 1425 (2005)Google Scholar
  3. 3.
    (a) J.A. Fernandes, R.A. Sá Ferreira, M. Pillinger, L.D. Carlos, J. Jepsen, A. Hazell, P. Ribeiro-Claro, and I.S. Gonçalves: J. Lumin. 113, 50 (2005), and references cited therein; (b) J.A. Fernandes, R.A. Sá Ferreira, M. Pillinger, L.D. Carlos, I.S. Gonçalves, and P.J.A. Ribeiro-Claro: Eur. J. Inorg. Chem. 3913 (2004), and references cited thereinGoogle Scholar
  4. 4.
    Sendor D., Kynast U., Adv. Mater. 14, 1570 (2002)CrossRefGoogle Scholar
  5. 5.
    Meng Q.G., Boutinaud P., Franville A.-C., Zhang H.J., Mahiou R., Microporous Mesoporous Mater. 65, 127 (2003)CrossRefGoogle Scholar
  6. 6.
    (a) H.F. Brito, C.A.A. Carvalho, O.L. Malta, J.J. Passos, J.F.S. Menezes, and R.D. Sinisterra: Spectrochim. Acta Part A 55, 2403 (1999). (b) S.S. Braga, R.A. Sá Ferreira, I.S. Gonçalves, M. Pillinger, J. Rocha, J.J.C. Teixeira-Dias, and L.D. Carlos: J. Phys. Chem. B 106, 11430 (2002). (c) S.S. Braga, R.A. Sá Ferreira, I.S. Gonçalves, P. Ribeiro-Claro, M. Pillinger, J. Rocha, J.J.C. Teixeira-Dias, and L.D. Carlos: J. Incl. Phenom. Macrocycl. Chem. 44, 261 (2002)Google Scholar
  7. 7.
    Binnemans K., Moors D., J. Mater. Chem. 12, 3374 (2002)CrossRefGoogle Scholar
  8. 8.
    Molina C., Dahmouche K., Messaddeq Y., Ribeiro S.J.L., Silva M.A.P., de Zea Bermudez V., Carlos L.D., J. Lumin. 104, 93 (2003)CrossRefGoogle Scholar
  9. 9.
    E. Fenyvesi, L. Szente, N.R. Russel, and M. McNamara: In J. Szejtli and T. Osa (eds.), Comprehensive Supramolecular Chem., Vol. 3, Chapter 10, Pergamon, Oxford (1996)Google Scholar
  10. 10.
    Charles R.G., Perrotto A., J. Inorg. Nucl. Chem. 26, 373 (1964)CrossRefGoogle Scholar
  11. 11.
    Saenger W., Angew. Chem. Int. Ed. Engl. 19, 344, (1980)CrossRefGoogle Scholar
  12. 12.
    Carlos L.D., de Mello Donegá C., Albuquerque R.Q., Alves S Jr., Menezes J.F.S., Malta O.L., Mol. Phys. 101: 1037 (2003)CrossRefGoogle Scholar
  13. 13.
    Reinhardt R., Richter M., Mager P.P., Carbohydr. Res. 291, 1, (1996)CrossRefPubMedGoogle Scholar

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • José A. Fernandes
    • 1
  • Susana S. Braga
    • 1
  • Rute A. Sá Ferreira
    • 2
  • Martyn Pillinger
    • 1
  • Luís D. Carlos
    • 2
  • Paulo Ribeiro-Claro
    • 1
  • Isabel S. Gonçalves
    • 1
  1. 1.Department of ChemistryCICECO, University of AveiroAveiroPortugal
  2. 2.Department of PhysicsCICECO, University of AveiroAveiroPortugal

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