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 Zn2+ and Cd2+, but was quenched by other metal ions. On the other hand, in an acetonitrile solution, only Mg2+ 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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Kobayashi, H., Katano, K., Hashimoto, T. et al. Solvent Effect on the Fluorescence Response of Hydroxycoumarin Bearing a Dipicolylamine Binding Site to Metal Ions. ANAL. SCI. 30, 1045–1050 (2014). https://doi.org/10.2116/analsci.30.1045
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DOI: https://doi.org/10.2116/analsci.30.1045