π-Conjugated molecules identified for reversible and visual detection of F− in aqueous: Effect of heterocycle unit on sensing performance
作者:Zhengquan Yan、Cong Wang、Yulian Tang、Yanjie Zhu、Qianying Cao、Tianran Yang、Lei Hu
DOI:10.1016/j.saa.2019.117451
日期:2020.1
π-conjugated molecules containing aromatic heterocyclic (Dye 1) and aromatic ring (Dye 2) were identified and compared each other. Even with similar structures, they possessed quite different spectral and colorimetric responses to F−, Cl−, Br−, I−, NO3−, HSO4−, H2PO4−, ClO4− and CH3COO−, etc. The reason might result from the difference in withdraw-electron ability of aromatic and heterocyclic rings, which would
为了说明分子结构(尤其是杂环单元)对传感性能的影响,我们识别并比较了两种包含芳香族杂环(染料1)和芳香环(染料2)的π-共轭分子。即使有相似的结构,他们拥有相当不同的光谱和色度响应到F - ,氯- ,溴- ,我-,NO 3 -,HSO 4 -,H 2 PO 4 -,CLO 4 -和CH 3 COO -其原因可能是由于芳香族和杂环的吸电子能力不同,从而导致目标π共轭分子中活性H的酸度不同。在酸性水溶液,染料1表示至F可逆比率的比色反应-与来自亮黄色到紫色,一个很好的视觉颜色改变线性的2.0-35.0×10范围伴随-6 摩尔/ L和低检测限1.60×10 -7 mol / L。而染料2由于其活性氢的弱酸性而不会与任何阴离子发生反应。在优化条件下,染料1成功地应用于与F的比色或肉眼检测-RSD≤3.1%的环境水,茶和牙膏样品中。作为染料1和F识别机制-被证实是一个去质子以1:1的结合化学计量。