Solvent Effect on the Fluorescence Response of Hydroxycoumarin Bearing a Dipicolylamine Binding Site to Metal Ions

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  • KOBAYASHI Hiroyuki
    Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University
  • KATANO Kohei
    Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University
  • HASHIMOTO Takeshi
    Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University
  • HAYASHITA Takashi
    Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University

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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.

Journal

  • Analytical Sciences

    Analytical Sciences 30 (11), 1045-1050, 2014

    The Japan Society for Analytical Chemistry

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