科研之友
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摘要
A new ratiometric fluorescent sensor (DQO) based on N,N'-Di(quinolin-8-yl) oxalamide has been designed and synthesized for selective detection of Zn2+. The fluorescence ratio (I (536 nm)/I (450 nm)) of DQO was enhanced 10-fold when Zn2+ was present in a buffer aqueous solution at pH 8.66. The sensor showed linear response toward Zn2+ in the concentration range 0-15 mu M, and the detection limit was calculated to be 2.4 mu M. A Job's plot implied the formation of a DQO/Zn2+ complex with 1:1 stoichiometry, and the apparent association constant of DQO/Zn2+ complex was computed to be 1.5 x 10(4) M-1.
