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A new ratiometric fluorescent sensor (DQO) based on N,N'-Di(quinolin-8-yl) oxalamide has been designed and synthesized for selective detection of Zn. The fluorescence ratio (I /I) of DQO was enhanced 10-fold when Zn was present in a buffer aqueous solution at pH 8.66. The sensor showed linear response toward Zn in the concentration range 0-15 μM, and the detection limit was calculated to be 2.4 μM. A Job's plot implied the formation of a DQO/Zn complex with 1:1 stoichiometry, and the apparent association constant of DQO/Zn complex was computed to be 1.5 × 10 M.

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