A chelating coumarin-derived ligand sensitizes all emitting lanthanide ions in the solid state and gives high absolute quantum yields for ethanol solutions of complexes of Sm, Eu, Tb, and Dy, above 20% for the last two. Crystal structures of these four complexes are [Ln(Cum) 3 (H 2 O)(X)]·X where X = MeOH or EtOH.
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Guzmán-Méndez et al. (2018) studied this question.
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