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纯水中检测汞离子与银离子的菲啰啉类荧光探针
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作者单位
廖贤,袁剑英,牟兰,曾晞 贵州省大环化学及超分子化学重点实验室,贵州大学化学与化工学院 
基金项目:国家自然科学基金项目(21165006);教育部“春晖计划”项目(Z2016008)
中文摘要:合成了菲啰啉类化合物探针1,并通过核磁共振波谱( NMR)、质谱( MS)、红外光谱(IR)对其结构进行了表征。利用荧光发射光谱考察了探针1对Hg2+及Ag+的识别性能。结果表明,探针1在纯水介质中以荧光猝灭的方式识别Hg2+和Ag+,其结合比分别为1∶1和2∶1,检测的线性范围分别为9.0×10-7~1.1×10-5和8.0×10-7~7.0×10-6 mol/L,相关系数(r2)均大于0.99,检出限均低至10-8mol/L。根据探针1识别前后荧光强度的剧烈变化,建立了裸眼检测Hg2+和Ag+的可视化分析方法。通过等温量热滴定与1H NMR滴定考察了识别过程的热力学参数和作用机理。该研究对生物体及环境领域中Hg2+和Ag+的实时监测具有潜在的应用价值。
中文关键词:纯水介质  菲啰啉衍生物  荧光探针  汞离子  银离子
 
A Phenanthroline Based Fluorescence Probe for Identification of Hg2+and Ag+ in Pure Aqueous Medium
Abstract:A phenanthroline based fluorescent probe 1 was synthesized.The structure of the probe was characterized by nuclear magnetic resonance spectroscopy(NMR),masss pectrometry(MS) and infrared spectroscopy(IR),and the recognition performance of the probe toward Hg2+ and Ag+ was investigated by fluorescence emission spectroscopy.Results indicated that Hg2+ and Ag+ in pure water medium were recognized by the probe via fluorescence quenching with the ratios of 1∶1 and 2∶1,respectively.There were linear relationships for Hg2+ and Ag+ in the concentration ranges of 9.0×10-7-1.1×10-5mol/L and 8.0×10-7-7.0×10-6mol/L,respectively,with their correlation coefficients(r2) larger than 0.99.The limits of detection were both as low as 10-8 mol/L.A visual analysis method was established for the detection of trace Hg2+ and Ag+ using the probe based on the obvious changes of fluorescence intensity.The thermodynamic parameters and recognition mechanism were evaluated using isothermal titration calorimetry(ITC) and 1H NMR titration.This method has a potential application value for the real-time monitoring of Hg2+ and Ag+ in the biological and environmental fields.
Key Words:aqueous medium  phenanthroline derivative  fluorescence probe  Hg2+  Ag+
引用本文:廖贤,袁剑英,牟兰,曾晞.纯水中检测汞离子与银离子的菲啰啉类荧光探针[J].分析测试学报,2019,(6):706-711.
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