The accurate and effective identi cation of hydrogen sul de holds great signi cance for environmental monitoring. Azide-binding uorescent probes are powerful tools for hydrogen sul de detection. We combined the 2'-Hydroxychalcone scaffold with azide moiety to construct probe Chal-N 3 , the electronwithdrawing azide moiety was utilized to block the ESIPT process of 2'-Hydroxychalcone and quenches the uorescence. The uorescent probe was triggered with the addition of hydrogen sul de, accompanied by great uorescence intensity enhancement with a large Stokes shift. With excellent uorescence properties including high sensitivity, speci city selectivity, and wider pH range tolerance, the probe was successfully applied to natural water samples.

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The accurate and effective identification of hydrogen sulfide holds great significance for environmental monitoring. Azide-binding fluorescent probes are powerful tools for hydrogen sulfide detection. We combined the 2'-Hydroxychalcone scaffold with azide moiety to construct probe Chal-N3, the electron-withdrawing azide moiety was utilized to block the ESIPT process of 2'-Hydroxychalcone and quenches the fluorescence. The fluorescent probe was triggered with the addition of hydrogen sulfide, accompanied by great fluorescence intensity enhancement with a large Stokes shift. With excellent fluorescence properties including high sensitivity, specificity selectivity, and wider pH range tolerance, the probe was successfully applied to natural water samples.