A fluorescent probe L‐Cu²⁺ based on quinoline, coumarin and Cu²⁺ has been synthesized and characterized for hypochlorite determination. After copper ion was added to the solution of ligand L, the fluorescence quenching at 490 nm might result from a ligand–metal charge transfer (LMCT) process and its strong coordination ability for Cu²⁺. In the presence of hypochlorite, the structure of ligand L was destroyed to form 7‐(diethylamino)‐coumarin‐3‐carboxylic acid, and the fluorescence was restored at 460 nm. In this case, L‐Cu²⁺ complex could be used as a fluorescent probe to detect hypochlorite, with the advantages of rapid, selective, wide linear range and low detection limit.

中文翻译：

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一种基于喹啉和香豆素的开启式荧光探针，用于快速，选择性和灵敏地检测水中的次氯酸盐。

合成了基于喹啉，香豆素和Cu ²⁺的荧光探针L -Cu ²⁺并进行了次氯酸盐测定。将铜离子添加到配体L的溶液中后，在490 nm处的荧光猝灭可能是由于配体-金属电荷转移（LMCT）过程及其对Cu ^2+的强配位能力引起的。在存在次氯酸盐的情况下，配体L的结构被破坏，形成7-（二乙氨基）-香豆素-3-羧酸，荧光在460 nm处恢复。在这种情况下，L‐ Cu ²⁺ 该复合物可用作荧光探针检测次氯酸盐，具有快速，选择性，线性范围宽，检测限低的优点。