Department of Chemistry and Center for NanoScience, University of Munich, Butenandtstraße 11E, Munich, Germany.
Sci Rep. 2013;3:2562. doi: 10.1038/srep02562.
The detection, differentiation and visualization of compounds such as gases, liquids or ions are key challenges for the design of selective optical chemosensors. Optical chemical sensors employ a transduction mechanism that converts a specific analyte recognition event into an optical signal. Here we report a novel concept for fluoride ion sensing where a porous crystalline framework serves as a host for a fluorescent reporter molecule. The detection is based on the decomposition of the host scaffold which induces the release of the fluorescent dye molecule. Specifically, the hybrid composite of the metal-organic framework NH2-MIL-101(Al) and fluorescein acting as reporter shows an exceptional turn-on fluorescence in aqueous fluoride-containing solutions. Using this novel strategy, the optical detection of fluoride is extremely sensitive and highly selective in the presence of many other anions.
化合物（如气体、液体或离子）的检测、区分和可视化是设计选择性光学化学传感器的关键挑战。光学化学传感器采用一种转换机制，将特定的分析物识别事件转换为光学信号。在这里，我们报告了一种新型的氟离子传感概念，其中多孔结晶骨架作为荧光报告分子的主体。检测基于主体支架的分解，这诱导荧光染料分子的释放。具体来说，金属-有机骨架 NH2-MIL-101(Al) 和荧光素的混合复合材料作为报告物在含有氟化物的水溶液中表现出异常的开启荧光。使用这种新策略，在存在许多其他阴离子的情况下，对氟化物的光学检测具有极高的灵敏度和选择性。
