“…For instance, the methylene blue method has a low detection sensitivity at the micromolar level. The fluorescent probe detection tool has obtained huge development thanks to its manifold advantages including high sensitivity, specific selectivity, low expenses, in situ and fast detection, robust compatibility, and scalability. − These advantages make the fluorescent probe method a hotspot field, and copious fluorescent chemosensors have also been developed for sensitively detecting specific analytes in vitro and vivo , food samples, and water environment. − These fluorescent probes often were designed based on the traditional fluorophores, such as coumarin, NBD, 1,8-naphthalimide, cyanine, pyrene, xanthene, etc. − To some degree, there were some developed fluorescent probes still existing a few drawbacks, such as using large amounts of organic solvents to realize the required emission signal, poor anti-interference ability and selectivity from other sulfur-containing analytes, requiring complicated operating procedures, and low synthesis productivity. − Therefore, to address the limitations enumerated above, it is vital and promising to develop novel small molecular fluorescent probes for specifically and on-the-spot monitoring of H 2 S in aqueous media …”