Analysis of the temperature dependence of the racemization of Eu(III) complexes through measurement of steady-state circularly polarized luminescence

The temperature dependence of the steady-state luminescence dissymmetry ratio, g lum, has been measured for racemic Eu(III) complexes containing the terdentate ligands dipicolinate and phenylethynyl-dipicolinate. As the temperature is increased, the magnitude of the dissymmetry ratio for these speci...

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Bibliographic Details
Published in:Journal of luminescence 2000-02, Vol.86 (1), p.61-66
Main Authors: Belair, Stephen D., Maupin, Christine L., Logue, Marshall W., Riehl, James P.
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Chirality
Europium
Exact sciences and technology
Fluorescence and phosphorescence spectra
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Kinetics
Molecular properties and interactions with photons
Physics
Racemization
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Summary:The temperature dependence of the steady-state luminescence dissymmetry ratio, g lum, has been measured for racemic Eu(III) complexes containing the terdentate ligands dipicolinate and phenylethynyl-dipicolinate. As the temperature is increased, the magnitude of the dissymmetry ratio for these species decreases due to racemization occurring during the excited state lifetime. The temperature dependence of g lum is analyzed by a non-linear curve-fitting technique to determine the activation energies for the interconversion of the enantiomers. Comparison is made with previous measurements involving time-resolved circularly polarized luminescence.
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(99)00175-1