Artifacts in CPL Measurements

4 Proposed Inslrumental Improvements to Record Eu(in)-Based CPL Signals 

It is worth mentioning that the proposed experimental advantage that may be obtained in chiral Eu(lll) systems by being able to scan in the spectral region corresponding to the Dj - Fq absorption was illustrated by measuring the emission detected circular dichro-ism (EDCD) and CPL spectra of a perturbed chiral equilibrium involving [Eu(DPA)3] and (+)-dimethyl-L-tartrate, and also the chiral [Eu (/ ,/ ) —complex [86,87]. 

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Circularly polarized luminescence spectroscopy (CPLS) is a measure of the chirality of a luminescent excited state. The excitation source can be either a laser or an arc lamp, but it is important that the source of excitation be unpolarized to avoid possible photoselection artifacts. The CPLS experiment produces two measurable quantities, which are obtained in arbitrary units and related to the circular polarization condition of the luminescence. It is appropriate to consider CPLS spectroscopy as a technique that combines the selectivity of CD with the sensitivity of luminescence. The major limitation associated with CPLS spectroscopy is that it is confined to emissive molecules only. 

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