Relaxation of Excited Eu(III) Complexes in Cetyltrimethylammonium Bromide Micellar Solutions

• Authors: C. Sennoga , C. Flint
• Languages of publication: EN

Abstracts

EN

The equilibria between pyridine-2,6-dicarboxylate and Eu(III) in H_{2}O or D_{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^{3+}]:[pdc^{2-}] ≥ 1:4 at neutral to slightly alkaline conditions but is incomplete under acidic conditions. The ^{5}D_{0} lifetimes corresponding to the Eu(pdc)_{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^{3+} and Nd(pdc)_{3}^{3-} complexes or confinement of the Ln(pdc)_{3}^{3-}/Eu^{3+} on the micelle surface. Energy transfer from the Eu(pdc)_{3}^{3-} anion is inefficient in the bulk solution.

Keywords

EN

33.50.Dq; 82.20.Rp

Discipline

• 82.20.Rp: State to state energy transfer(see also 31.70.Hq Time-dependent phenomena—in atomic and molecular physics)
• 33.50.Dq: Fluorescence and phosphorescence spectra

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1996
• Volume: 90
• Issue: 2
• Pages: 327-332

Dates

published

1996-08

Contributors

author

C. Sennoga

• Laser Laboratory, Department of Chemistry, Birkbeck College, University of London, Gordon House, 29 Gordon Square, London WC1H 0PP, United Kingdom

author

C. Flint

• Laser Laboratory, Department of Chemistry, Birkbeck College, University of London, Gordon House, 29 Gordon Square, London WC1H 0PP, United Kingdom

Identifiers

DOI

10.12693/APhysPolA.90.327