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A novel rhodamine-triazole-pyridine multi-dentate chromophore for colorimetric and “turn on” fluorescent sensing trace Sn2+

yanzhengquan 添加于 2018/7/23 18:06:51  1632次阅读 | 0次推荐 | 0个评论

A multidentate ligand chromophore, combining rhodamine, triazole, and pyridine units, was identified and developed for the first time. Using triazole and pyridine rings as coordinating functional recognition groups, it was expected to selectively recognize Sn2+ to form some stable 5-member or 6-member rings with nitrogen and oxygen atoms. Under the optimized conditions, the ligand chromophore could selectively react with trace Sn2+ in CH3CN/H2O (99/1, v/v), accompanying with obvious changes in fluorescent spectrum, ultraviolet-visible spectrum and visual color. For fluorescent analysis, a turn-on fluorescence at 587 nm was found and increased linearly in the range of 1.2~6.2 ×10–7 mol·L−1 Sn2+ from colorless to orange. For ultraviolet-visible one, a new absorption peak at 560 nm emerged with a linear range of 2.0~11.0 ×10–7 mol·L−1 Sn2+ from colorless to pink. The action mechanism between the ligand chromophore and Sn2+ was confirmed basing on ultraviolet-visible titration, 1H NMR titration, Job’s plot, binding constants and theoretical calculation in detail.

作 者:Zhengquan Yan, Gang Wei, Shanyi Guang*, Manman Xu, Rongliang Wu, Gang Zhao, Fuyou Ke, Hongyao Xu*
期刊名称: Dyes & Pigments
期卷页: 2018 第159卷 第期 542-550页
学科领域:化学科学 » 分析化学 » 光谱分析
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DOI: https://doi.org/10.1016/j.dyepig.2018.07.028
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