Abstract
Steady-state and time-resolved chiroptical luminescence measurements are used to investigate enantioselective excited-state quenching processes in solution. Theory and measurement methodology are presented for the case in which an initially racemic excited-state population of chiral luminophores evolves to a nonracemic population in the presence of chiral quencher molecules. Generation of enantiomeric excess in the luminophore excited-state population produces differential (spontaneous) emission of left and right circularly polarized light, and the time dependence of this chiroptical luminescence provides a direct measure of the differential excited-state quenching kinetics associated with homochiral versus heterochiral luminophore-quencher interactions. Experimental results are presented for a series of systems in which the luminophores are dissymmetric, tris(terdentate) lanthanide complexes and the quenchers are dissymmetric, tris(bidentate) transition-metal complexes.
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