摘要/Abstract

合成出了1个新型基于咔唑的席夫碱衍生物L，评价了其在水性介质中选择性检测HSO₄^-离子的性能.在CH₃CN-H₂O（V：V=9：1）中，N-（9-乙基-咔唑-3-基）-1-甲基-1-（4-硝基苯基）甲亚胺（L）通过席夫碱的水解反应，能够选择性地识别HSO₄^-离子，并引起从橙色到无色明显的视觉颜色变化；在紫外灯下，显示出蓝色荧光.在其它阴离子存在下，由HSO₄^-离子引起的荧光增强现象没有受到影响.通过Job曲线、¹H NMR滴定光谱和HRMS谱研究了探针L检测HSO₄^-的机理.探针L对HSO₄^-离子的检出限为1.91×10^-8mol·L^-1.化合物L是HSO₄^-的高选择性、高灵敏度的比色和荧光增强型探针.
关键词: HSO₄^-, 咔唑, 席夫碱, 比色, 荧光, 水解
A novel carbazole-based Schiff base derivative L was synthesized and evaluated for the property of selective detection of HSO₄^- ion in aqueous medium. N-(9-Ethyl-carbazol-3-yl)-1-methyl-1-(4-nitrophenyl)-methanimine (L) selectively recognized HSO₄^- ion in CH₃CN-H₂O (V:V=9:1) via the hydrolysis reaction of Schiff bases to elicit a distinct visual colour change from orange to colorless with a significant blue fluorescence under the UV lamp. The fluorescence enhancement phenomenon caused by HSO₄^- ion did not change in the presence of other anions. The sensing mechanism of probe L for HSO₄^- had been investigated by Job's plot, ¹H NMR titration spectra and HRMS spectrum. The detection limit for the HSO₄^- ion was determined as 1.91×10^-8mol·L^-1. The compound L can be used as a highly selective and sensitive colorimetric, and fluorescent turn-on probe for HSO₄^-.
Key words: HSO₄^-, carbazole, Schiff base, colorimetric, fluorescent, hydrolysis


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