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Preparation of 4,4’-bis-(carboxyl azobenzene)-dibenzo-18-crown-6 dye and its application on ratiometric colorimetric recognition to Hg2+

yanzhengquan 添加于 2017/2/2 10:34:40  139次阅读 | 0次推荐 | 0个评论

A multifunctional dye, 4,4-bis-(carboxyl phenylazo)-dibenzo-18-crown-6 dye (BCADC) was designed and prepared via diazotization and coupling reaction of dibenzo-18-crown-6 with p-amino benzoic acid. The dye, combining crown ether ring, azo and carboxyl group, exhibits well-defined Hg2+-selective ratiometric colorimetric behavior, with the maximum absorbance peak changing from 354nm to 408nm exclusively. Under the optimum conditions, the recognition to Hg2+ has a linear range of 2.5–58×10−7 mol L−1 with a 0.9978 correlation coefficient. The method was applied to analyse 3 environmental water samples with a detection limit of 2.9×10−8 mol L−1 and a relative standard deviation (R.S.D.) lower than 3.7% (n = 5). The action mechanism between BCADC and metal ions was discussed by means of Job’s plots and theoretical calculations.

作 者: Zhengquan Yan*, Lei Hu, Li Nie, Hong Lv
期刊名称: Spectrochim. Acta, Part A
期卷页: 2011 第79卷 第3期 661-665页
学科领域:化学科学 » 分析化学 » 光谱分析
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