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  • Title: Solvent effect on the fluorescence response of hydroxycoumarin bearing a dipicolylamine binding site to metal ions.
    Author: Kobayashi H, Katano K, Hashimoto T, Hayashita T.
    Journal: Anal Sci; 2014; 30(11):1045-50. PubMed ID: 25382039.
    Abstract:
    The fluorescence behavior of a probe dpa-HC, which has a coumarin derivative that acts as a fluorophore and a dipicolylamine (DPA) unit that functions as a metal ion-recognition site, was investigated with various metal ions in aqueous and several non-aqueous solvents. In aqueous solution, the fluorescence of dpa-HC was enhanced by Zn(2+) and Cd(2+), but was quenched by other metal ions. On the other hand, in an acetonitrile solution, only Mg(2+) enhanced the fluorescence, and the addition of a small amount of water quenched this fluorescence. This dramatic selectivity change is explained by stabilization of a metal-dpa-HC complex due to acetonitrile coordination and ON-OFF switching of the intramolecular photoinduced electron transfer (PET) from the nitrogen lone pair of DPA to the coumarin derivative.
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