| Abstract
| - Excited state energy transfer between enantiomers in concentrated samples will diminish the differential excitedstate concentrations of a photoenriched racemic mixture, and this phenomenon will be reflected in a decreasein the observed circularly polarized luminescence as compared to low concentration samples where this energytransfer 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 experimentalobservation of this phenomenon for samples prepared in high concentration by incorporation into high-qualitystrain-free sol−gels. These results are fit to a theoretical model appropriate for randomly oriented and dispersedsolute chromophores, and the Förster critical transfer distance is obtained. Limitations of the model and otherexperimental difficulties are described.
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