- Tytuł:
- Relaxation of Excited Eu(III) Complexes in Cetyltrimethylammonium Bromide Micellar Solutions
- Autorzy:
-
Sennoga, C. A.
Flint, C. D. - Powiązania:
- https://bibliotekanauki.pl/articles/1945625.pdf
- Data publikacji:
- 1996-08
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
33.50.Dq
82.20.Rp - Opis:
- The equilibria between pyridine-2,6-dicarboxylate and Eu(III) in H$\text{}_{2}$O or D$\text{}_{2}$O cetyltrimethylammonium bromide micellar solutions at room temperature have been made as a function of the ligand concentration and pH by excitation spectroscopy and emission decay measurements. Formation of the tris-complex is complete at [Eu$\text{}^{3+}$]:[pdc$\text{}^{2-}$] ≥ 1:4 at neutral to slightly alkaline conditions but is incomplete under acidic conditions. The $\text{}^{5}$D$\text{}_{0}$ lifetimes corresponding to the Eu(pdc)$\text{}_{3}^{3-}$ anion is observed to increase on association of the complex with the micellar surface due to exclusion of the solvating molecules from the second co-ordination sphere. Energy transfer in the bulk solution requires the presence of binuclear mixed Eu$\text{}^{3+}$ and Nd(pdc)$\text{}_{3}^{3-}$ complexes or confinement of the Ln(pdc)$\text{}_{3}^{3-}$/Eu$\text{}^{3+}$ on the micelle surface. Energy transfer from the Eu(pdc)$\text{}_{3}^{3-}$ anion is inefficient in the bulk solution.
- Źródło:
-
Acta Physica Polonica A; 1996, 90, 2; 327-332
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł