Highly sensitive and selective detection of triphosgene with a 2-(2′-hydroxyphenyl)benzimidazole derived fluorescent probe

In this work, a 2-(2′-hydroxyphenyl)benzimidazole derived fluorescent probe, 2-(2′-hydroxy-4′-aminophenyl)benzimidazole ( 4-AHBI ), was synthesized and its fluorescent behavior toward triphosgene were evaluated. The results showed that 4-AHBI exhibited high sensitivity (limit of detection, 0.08 nM) and excellent selectivity for triphosgene over other acyl chlorides including phosgene in CH 2 Cl 2 solution. Moreover, 4-AHBI loaded test strips were prepared for the practical sensing of triphosgene. A C4′ amino substituted 2-(2′-hydroxyphenyl)benzimidazole probe ( 4-AHBI ) was designed and synthesized for highly selective and sensitive detection of triphosgene with low detection limit (0.08 nM) over range of 0-0.5 μM.