Analytical Sciences

8-Hydroxyquinoline Derivative as a Fluorescent Chemosensor for Zinc Ion

Jun KAWAKAMI,  Masaki OHTA, Yasuhiro YAMAUCHI, and Kunio OHZEKI

Department of Materials Science and Technology, Faculty of Science and Technology,Hirosaki University, Bunkyo-cho 3, Hirosaki, Aomori 036-8561, Japan

8-Hydroxyquinoline derivative 1 as a fluorescent chemosensor for Zn²⁺ was synthesized. Because Cd²⁺ is often found with Zn²⁺ in the environment and can form fluorescent complexes with chelating fluorophores, a potentially important property of chemosensors for Zn²⁺ is their selectivity for Zn²⁺ over Cd²⁺. The Zn²⁺ or Cd²⁺ complexes of 1 gave an emission band from the 1:1 complex, but the fluorescence intensity for Cd²⁺ was a half of that for Zn²⁺. Ligand 1 is suited for use as a fluorescent chemosensor for Zn²⁺.

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