Excitation energy transfer in europium chelate with doxycycline in the presence of a second ligand in micellar solutions of nonionic surfactants |
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Authors: | T D Smirnova S N Shtykov V I Kochubei E S Khryachkova |
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Institution: | 1.Chernyshevsky State University,Saratov,Russia |
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Abstract: | The complexation of Eu3+ with doxycycline (DC) antibiotic in the presence of several second ligands and surfactant micelles of different types is
studied by the spectrophotometric and luminescence methods. It is found that the efficiency of excitation energy transfer
in Eu3+-DC chelate depends on the nature of the second ligand and surfactant micelles. Using thenoyltrifluoroacetone (TTA) as an
example, it is shown that the second ligand additionally sensitizes the europium fluorescence, and the possibility of intermediate
sensitization of DC and then of europium is shown by the example of 1,10-phenanthroline. In all cases, the excitation energy
transfer efficiency was increased due to the so-called antenna effect. The decay kinetics of the sensitized fluorescence of
the binary and mixed-ligand chelates in aqueous and micellar solutions of nonionic surfactants is studied and the relative
quantum yields and lifetimes of fluorescence are determined. |
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