Quinoline based colorimetric and “turn-off” fluorescent chemosensor for phosgene sensing in solution and vapor phase

Abstract

Phosgene (COCl2) is a kind of extreme poisonous and colorless gas, causing many serious health problems. It’s an urgent requirement to develop a convenient and efficient analytical methods for detection of phosgene in environmental systems. In this work, we have constructed “turn-off” fluorescence signals of phosgene fluorescent chemosensor Q-1 based on quinoline as fluorophores and oxime as recognition group, which displayed a low detection limit (LOD = 5.55 × 10-6 M) and rapid response (<1 min). The structure of the probe Q-1 was analyzed by NMR and X-ray. Q-1 can be used to clearly distinguish phosgene under 365 nm UV lamp and visible light. Moreover, the test paper with Q-1 was prepared for detection of phosgene gas in air.