A probe with an isothiocyanate group was synthesized and evaluated for its HS sensing ability. Upon addition of HS, the probe exhibited ratiometric properties during absorption with a red-shift. The probe exhibited fluorescent off-on responses towards HS via the ESIPT process, due to the conversion of isocyanate into amine. UV-vis, fluorescence, and H NMR spectroscopic analyses were performed to investigate the sensing mechanism. The probe has a large Stokes shift, short response time, and low detection limit. It can be used to estimate HS levels within the range of 0-36 nM. The practical applicability of the probe was demonstrated using water samples and living cells.
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