A fluorescent probe, 4-(di-phenylamino)-benzaldehyde oxime (DPBO), has been developed comprising of 4-(diphenylamino) benzaldehyde as the fluorophore and hydroxyl amine, where the resutant oxime group leads to the formation of a recognition site for the selective "on-off" fluorescent detection of lethal phosgene with the dimer fomation of DPBO through carbonate linkage generated from phosgene. The probe DPBO also exhibits notable spectrofluorometric response in different solvents, as demonstrated by SEM analysis. The detection limit of the probe DPBO towards phosgene has been calculated as 21.53 μM, with a fast reaction response time within 30 sec and the fluorescence quenching efficiency of DPBO by phosgene was measured through the Stern-Volmer quenching constant (KSV) estimated at 1.03×104 M−1. Confirmation of the sensing mechanism is achieved through various spectroscopic techniques like UV-vis, emission spectroscopy, mass spectrometry, and computational studies. For practical applications, the sensor DPBO can be utilized for the detection of phosgene in household bleach, soil analysis and dipstick method.

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