Circular polarization of luminescence

Other methods150 involve isotopic dilution,151 kinetic resolution,152 13C nmr relaxation rates of diastereomeric complexes,153 and circular polarization of luminescence.154... 

Direct asymmetric cpl-induced photoreactions are only observed if there are two enantiomeric ground state reactants presgntthat absorb different amounts of light. Thus the asymmetry of the cpl source is transformed into a different concentration of excited-state enantiomeric species, which becomes obvious in emitting systems in the circular polarization of luminescence [7]. These in turn react in a nonchiral environment with the same rate constants for the different deactivation channels. Thus asymmetric photoreactions are dependent or independent parallel reactions of the enantiomers with different net rates. 

Bruce JI, Dickins RS, Govenlock LJ, Gimnlaugsson T, Lopinski S, Lowe MP, Parker D, Peacock RD, Perry JJB, Aime S, Botta M. 2000. The selectivity of reversible oxy-anion binding in aqueous solution at a chiral europium and terbium center signaling of carbonate chelation by changes in the form and circular polarization of luminescence emission. J Am Chem Soc 122 9674-9684. 

Steinberg IZ, Gafui A. Sensitive Instrument for the Study of Circular Polarization of Luminescence. Rev Sci Instmm 1972 43 409 13. 

Tinoco J, I., Ehrenberg B, Steinberg E. Eluorescence Detected Circular Dichroism and Circular Polarization of Luminescence in Rigid Media Direction Dependent Optical Activity Obtained by Photoselection. J Chem Phys 1977 66 916-920. 

In addition to ORD and CD, the optical activity of a dissymmetric molecule is manifested in an additional spectroscopic property if the molecule is luminescent. Circular polarization of luminescence (CPL)... 

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