溶液中选择识别Hg(Ⅱ)的基于罗丹明的荧光传感器

设计合成了一种可在含水体系中选择性识别Hg²⁺的荧光传感器(化合物1)，该化合物中同时包含了作为信号输出基团的罗丹明6G和作为键合基团的2-取代吡啶。其结构得到了¹H NMR，ESI-HRMS和单晶X-ray衍射分析的确认。在混合的水体系中，该化合物对二价汞离子表现出高选择性和高灵敏度的荧光和显色传感，体系的发光伴随着汞离子的加入而得以增强，颜色由无色变成粉红色。荧光滴定、ESI-HRMS和Job曲线分析都显示该传感器分子和汞离子形成1∶1的配合物。

A Rhodamine-Based Fluorescent Chemsensor for Hg(Ⅱ)with High Selectivity in Solution

A fluoresencent chemsensor (compound 1) for the detection of Hg2+ ion was designed and synthesized. This sensor was prepared by incorporating the well-known Rhodamine 6G fluorophore and the 2-pyridinecarbaldehyde binding unit into one molecule. The structure of 1 was fully characterized by 1H NMR, ESI-HRMS and X-ray crystallographic analyses. The emission properties of compound 1 were investigated in a mixed aqueous environment. Upon addition of Hg2+ ion, the emission increased accompanied by a color change from colorless to pink. It exhibited a high selectivity for Hg(Ⅱ) even over a complicated background of excess other metal ions as potential competing species. The metal-binding properties of 1 were studied by fluorescent titration, ESI-HRMS and Job's plot analysis. All the studies suggest a 1:1 stoichiometry for the 1·Hg complex. CCDC: 717917.