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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Colorimetric and Fluorescent Sensing of SCN- Based on meso-Tetraphenylporphyrin/meso-Tetraphenylporphyrin Cobalt(II) System
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Colorimetric and Fluorescent Sensing of SCN- Based on meso-Tetraphenylporphyrin/meso-Tetraphenylporphyrin Cobalt(II) System

机译：基于中四苯基卟啉/中四苯基卟啉钴（II）体系的SCN的比色和荧光传感

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An approach for colorimetric and fluorescent sensing of thiocyanate (SCN-) has been proposed based on the competitive-displacement strategy between meso-tetraphenylporphyrin (TPP) and meso-tetraphenylporphyrin cobalt(II) (CoTPP). In THF-water solution, TPP emits strong fluorescence at 651 nm; however, the fluorescence was quenched stepwise by CoTPP, and then restored by SCN-, the detection limit is 6.0 × 10-4 M. The recognition of SCN- could also be easily achieved by visual way since the assembly system showed significant color change by the anion. Both the fluorescence and the color change of the system exhibits remarkably high selectivity to SCN- over a large series of anions. The interaction mechanisms among TPP, CoTPP and SCN- were primarily investigated by fluorescence lifetime. The quenching of TPP fluorescence is attributed to the formation of TPP/CoTPP aggregates, and the fluorescence restoration is due to the binding of CoTPP with SCN-, releasing the free TPP. This simple system has the potential to be used as a latent fluorescent sensing approach for SCN- for environmental analysis.
机译：基于中四苯基卟啉（TPP）和中四苯基卟啉（II）钴（CoTPP）之间的竞争置换策略，提出了一种硫氰酸盐（SCN -）的比色和荧光传感方法。在THF水溶液中，TPP在651 nm处发出强荧光；然而，用CoTPP逐步猝灭荧光，然后用SCN -恢复，检出限为6.0×10 -4 M。SCN -的识别也可以通过视觉方式轻松实现，因为组装系统显示阴离子显着改变了颜色。该体系的荧光和颜色变化都显示出在一系列阴离子上对SCN -的显着高选择性。主要通过荧光寿命研究了TPP，CoTPP和SCN -之间的相互作用机理。 TPP荧光的猝灭归因于TPP / CoTPP聚集体的形成，而荧光恢复归因于CoTPP与SCN -的结合，从而释放出游离的TPP。这个简单的系统有潜力用作SCN -的潜在荧光传感方法，用于环境分析。

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