School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China.
Analyst. 2018 Nov 5;143(22):5395-5403. doi: 10.1039/c8an01130c.
A novel water-soluble polymer bearing a rhodamine receptor (PEGSRh) was synthesized as a dual chemosensor for the recognition of Cu2+ and Hg2+ in 100% aqueous solution. PEGSRh not only exhibited a sensitive colorimetric response towards Cu2+ and Hg2+ but also showed a selective turn-on fluorescence response towards Hg2+ over other metal ions. The binding stoichiometry for the complexation of PEGSRh with Cu2+ and Hg2+ was confirmed to be 1 : 1 by Job plot analysis. The low detection limits were found to be 5.92 × 10-7 M for Cu2+ and 2.85 × 10-6 M for Hg2+. The responses of PEGSRh to Cu2+ and Hg2+ were both stable over wide pH ranges. In addition, the fluorescence intensity changes of PEGSRh solution by the inputs of Hg2+, Cu2+ and EDTA have been used to construct a combinational logic gate. Again, an INHIBIT logic gate was also obtained by employing Cu2+ and EDTA as the chemical inputs and the absorbance signal as the output. Moreover, test papers were prepared facilely using PEGSRh for practical on-site detection of Cu2+ and Hg2+.
一种新型的水溶性聚合物，带有一个罗丹明受体（PEGSRh），被合成作为一个双重化学传感器，用于在 100%水溶液中识别 Cu2+和 Hg2+。PEGSRh 不仅对 Cu2+和 Hg2+表现出敏感的比色响应，而且对 Hg2+表现出选择性的开荧光响应，而对其他金属离子则没有。通过 Job 图分析，证实 PEGSRh 与 Cu2+和 Hg2+的络合比为 1:1。Cu2+和 Hg2+的检测限分别低至 5.92×10-7 M 和 2.85×10-6 M。PEGSRh 对 Cu2+和 Hg2+的响应在宽 pH 范围内都很稳定。此外，通过输入 Hg2+、Cu2+和 EDTA，PEGSRh 溶液的荧光强度变化已被用于构建组合逻辑门。同样，通过将 Cu2+和 EDTA 作为化学输入，并将吸光度信号作为输出，也获得了一个 INHIBIT 逻辑门。此外，还使用 PEGSRh 制备了测试纸条，用于实际的现场检测 Cu2+和 Hg2+。
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