We have constructed a novel fluorescein-based fluorescent chemosensor, FL-In, functionalised with an indole moiety and capable of sensing by both the optical “turn-on” and electrochemical detection of carbonate ions (CO₃²⁻) in aqueous media. The probe exhibits excellent selectivity and a low detection limit (0.27 µM) regarding carbonate ions by a possible coordination and hydrolysis reaction mechanism. The developed probe successfully detected CO₃²⁻ ions in different samples of water. Also, in a simple filter paper experiment, we documented its ability to allow the monitoring of CO₃²⁻ with the naked eye.

Grpahical Abstract

中文翻译：

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基于荧光素的三通道探头，用于选择性和灵敏检测水环境和真实水样中的 CO32− 离子

我们已经构建了一种新型的基于荧光素的荧光化学传感器FL-In，它被一个吲哚部分功能化，并且能够通过光学“开启”和电化学检测水介质中的碳酸根离子 (CO ₃ ^{2- ) 进行传感。}该探针通过可能的配位和水解反应机制对碳酸根离子表现出优异的选择性和低检测限 (0.27 µM)。开发的探针成功地检测了不同水样中的CO ₃ ^2-离子。此外，在一个简单的滤纸实验中，我们记录了它允许用肉眼监测 CO ₃ ^{2-的能力。}

图形摘要