Russian Chemical Bulletin

, Volume 47, Issue 8, pp 1466–1471 | Cite as

The influence of excitation of the 4f-orbital of Eu(fod)3 on complex formation with adamantanone and anomalous enhancement of Eu3+ luminescence under the action of H2O and D2O molecules in toluene

  • S. S. Ostakhov
  • A. I. Voloshin
  • V. P. Kazakov
  • N. M. Shavaleev
Physical Chemistry


The influence of excitation of the 4f-orbital of, β-diketonate Eu(fod)3 (fod is heptafluorodimethyloctanedione) on the formation of the coordination bond with adamantanone (1) was studied by the nonradiative energy transfer technique. The kinetic parameters of fluorescence (FL) and the lifetime (τ) of the Eu3+ ion in toluene solutions were studied. The increase in the stability of the Eu(fod)3·1 complex when f—f-transitions of the Eu3+ ion are excited is related to an increase in the acceptor capability of Eu(fod)3 due to the increasing fraction of the covalent component determined by the participation of 4f-orbitals. An unexpected effect of enhancement of the Eu(fod)3 fluorescence under the action of H2O (D2O) molecules in toluene solutions was observed. The effect is assumed to be caused by an increase in the negative inductive effect when outer-sphere associates with the fluorinated radical of β-diketonate are formed. The mechanisms of the influence of electron-donating inner-sphere ligands and outer-sphere associates on the quantum yield of fluorescence of Eu(fod)3 are discussed.

Key words

fluorescence, nonradiative energy transfer Eu(iii) β-diketonate, adamantanone, complex formation 


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Copyright information

© Plenum Publishing Corporation 1998

Authors and Affiliations

  • S. S. Ostakhov
    • 1
  • A. I. Voloshin
    • 1
  • V. P. Kazakov
    • 1
  • N. M. Shavaleev
    • 1
  1. 1.Institute of Organic ChemistryUfa Research Center of the Russian Academy of SciencesUfaRussian Federation

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