新型席夫碱高灵敏荧光探针用于Al3＋的测定

A novel highly sensitive fluorescent probe based on Schiff base for Al^(3+)

本文报道了一种新型席夫碱8-羟基-久洛尼定-(2-吡啶)腙(L)的荧光探针,并用于识别检测Al^(3+).探针L与Al^(3+)络合使溶液颜色由淡黄色变为黄色,同时在480 nm处荧光显著增强,可实现Al^(3+)的选择性识别检测,检测限为8.22×10^(-8)M.通过等摩尔连续变化法测定及质谱表征,L与Al^(3+)形成1:1的络合物,核磁共振光谱进一步确定L与Al^(3+)的结合模式,为探针L应用于离子传感器研制奠定了理论基础.

A facile Schiff-base ligand 8-hydroxyjulolidine-pyridyl hydrazone （L） as the fluorescent probe was synthesized and characterized. L was selective toward Al^（3＋） ions with a visible color change from pale-to-yellow and fluorescence enhancement at 480 nm.L forms complex with Al^（3＋） in 1：1 ratio as supported by Job’s plot analysis and ESI-MS. The binding mode was further confirmed by ~1H NMR titrations. The detection limit was calculated to be 8.22×10^（-8）M for Al^（3＋）. These merits of L, i.e., requiring facile one-step synthesis and displaying high sensitivity make L a promising candidate as a chemosensor for Al^（3＋）ion.