Abstract
The complexes {Ln(DP)}Z where Ln3+ = 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 earth complexes are synthesized inside the super-cages of the zeolites; the degree of complexation never exceeds1DP/1Ln. Only the Ln ions, which are in the super-cages, may be complexed. Luminescent europium complexes encapsulated in zeolite matrices were obtained. The 5D0 → FJ 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.
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Dexpert-Ghys, J., Picard, C. & Taurines, A. Complexes of Rare Earths and Dipicolinato Ions Encapsulated in X- and Y-zeolites: Luminescence Properties. Journal of Inclusion Phenomena 39, 261–267 (2001). https://doi.org/10.1023/A:1011133313587
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DOI: https://doi.org/10.1023/A:1011133313587