The Effect of Excited State Energy Transfer on the Circularly Polarized Luminescence from Sol−Gels Containing Racemic Complexes of Eu(III): Theory and Experiment

Autor:	Jerzy Sokolnicki, Janina Legendziewicz, James P. Riehl
Rok vydání:	2002
Předmět:	Work (thermodynamics) Chemistry Energy transfer Chromophore Photochemistry Surfaces Coatings and Films Excited state Materials Chemistry Physical chemistry Racemic mixture Physical and Theoretical Chemistry Enantiomer Luminescence Volume concentration
Zdroj:	The Journal of Physical Chemistry B. 106:1508-1514
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp013674k
Popis:	Excited state energy transfer between enantiomers in concentrated samples will diminish the differential excited state concentrations of a photoenriched racemic mixture, and this phenomenon will be reflected in a decrease in the observed circularly polarized luminescence as compared to low concentration samples where this energy transfer process can be neglected. Such a decrease is reported here for complexes of Eu(III) with 2,6-pyridine-dicarboxylate and 2,2‘-bipyridine-N,N‘-dioxide = bpyO2 ligands. This work represents the first experimental observation of this phenomenon for samples prepared in high concentration by incorporation into high-quality strain-free sol−gels. These results are fit to a theoretical model appropriate for randomly oriented and dispersed solute chromophores, and the Forster critical transfer distance is obtained. Limitations of the model and other experimental difficulties are described.
Databáze:	OpenAIRE
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