Wydział Chemii

Vera I. Tsaryuk

Konstantin P. Zhuravlev

V. F. Zolin

Valentina A. Kudryashova

Janina Legendziewicz

Roman Szostak

2007

Journal of Applied Spectroscopy

74

51-59

Naukowa

Angielski

Artykuł

We discuss the possibility of optimizing the brightness of luminescence for phenylcarboxylates, naphthylcarboxylates,
and indolylcarboxylates of europium and terbium and their adducts with 1,10-phenanthroline and
2,2′-bipyridine by modifying the ligands. We have studied the efficiency of luminescence and luminescence excitation.
We consider the effect of blocking energy transfer from the ligands to the Eu3+ and Tb3+ ions by
methylene (–CH2–) bridges dividing the π-electron system of the ligands into two parts and by the electronacceptor
nitro group (–NO2). We have analyzed the pathways for transfer and degradation of the excitation
energy at 77 K and 300 K. From the phosphorescence spectra of gadolinium salts, we have determined the
energies of the lowest excited triplet states of the ligands. We consider the effect of the relative positions of
the triplet levels of the ligands and the excited levels of the Eu3+ and Tb3+ ions on the luminescence efficiency.
We found channels for dissipation of the excitation energy via the ππ∗ and nπ∗ states of the aromatic
system of the carboxylate and the NO2 group.

Eu3+ ion, Tb3+ ion, luminescence and luminescence excitation spectra, luminescence efficiency, aromatic carboxylates.

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