Exploring Coumarin Derivatives for High‐Performance Metal Ion Detection

The development of highly sensitive and selective chemosensors for metal ion detection is crucial for various applications in environmental monitoring, biological analysis, and clinical diagnostics. This review focuses on the design, synthesis, and application of coumarin‐based fluorescent and colorimetric chemosensors for the detection of a wide range of metal ions, including Mg 2+ , Al 3+ , Cr 3+ , Fe 2+ , Fe 3+ , Cu + , Cu 2+ , Zn 2+ , Ga 3+ , Pd 0 , Pd 2+ , Cd 2+ , La 3+ , Au 3+ , and Hg 2+ . Coumarin derivatives are highlighted for their excellent optical properties, including strong emission, high environmental stability, and low biological toxicity, making them ideal candidates for small‐molecule sensors. The review delves into the structural modifications of coumarin compounds that enhance their specificity and sensitivity towards target metal ions. We discuss critical parameters such as detection limits, naked‐eye and biological analysis potential, and detection mechanisms. This comprehensive overview emphasizes recent advancements in coumarin‐based probes, providing insights into their utility in real‐time monitoring, environmental protection, and medical diagnostics. By concentrating on the aqueous media applications and green chemistry principles, this paper serves as a valuable resource for researchers aiming to develop efficient and environmentally friendly metal ion sensors.