Pollution caused by the release of toxic heavy metals into the environment by industrial and farming processes has been regarded as a major problem worldwide. This has attracted a great deal of attention into restoration and remediation. Mercury is classified as a toxic heavy metal which has posed significant challenges to public and environmental health. To date, conventional methods for mercury detection rely on expensive, destructive, complex, and highly specialized methods. Evidently, there is a need to develop systems capable of easily identifying and quantifying mercury within the environment. In this way, organic-based colorimetric chemosensors are gaining increasing popularity due to their high sensitivity, selectivity, cost-effectiveness, ease of design, naked-eye, and on-site detection ability. The formation of coumarin-azo derivative AD1 was carried out by a conventional diazotization reaction with coumarin-amine 1c and N,N-dimethylaniline. Sensor AD1 displayed remarkable visual colour change upon mercury addition with appreciable selectivity and sensitivity. The detection limit was calculated as 0.24 µM. Additionally, the reversible nature of AD1 allowed for the construction of an IMPLICATION type logic gate and Molecular Keypad Lock. Chemosensor AD1 displayed further sensing applications in real-world water samples and towards on-site assay methods. Herein, we describe a coumarin-derived chemosensor bearing an azo (N = N) functionality for the colorimetric and quantitative determination of Hg²⁺ in organic and aqueous media.

工业和农业过程中有毒重金属释放到环境中造成的污染已被视为世界范围内的主要问题。这引起了人们对恢复和修复的极大关注。汞被归类为有毒重金属，对公众和环境健康构成了重大挑战。迄今为止，传统的汞检测方法依赖于昂贵、破坏性、复杂和高度专业化的方法。显然，需要开发能够轻松识别和量化环境中汞的系统。通过这种方式，基于有机的比色化学传感器因其高灵敏度、选择性、成本效益、易于设计、裸眼和现场检测能力而越来越受欢迎。香豆素-偶氮衍生物的形成AD1是通过与香豆素-胺1c和 N,N-二甲基苯胺的常规重氮化反应进行的。传感器AD1在添加汞后显示出显着的视觉颜色变化，具有明显的选择性和灵敏度。检测限计算为 0.24 µM。此外，AD1的可逆特性允许构建蕴涵式逻辑门和分子键盘锁。Chemosensor AD1展示了在现实世界水样和现场检测方法中的进一步传感应用。^{在此，我们描述了一种香豆素衍生的化学传感器，其具有偶氮 (N = N) 功能，用于 Hg 2+}的比色和定量测定在有机和水性介质中。