Abstract
This report introduces a colorimetric benzoxazole-scaffold molecule, BPDA, to recognize a toxic sarin gas mimic, diethylchlorophosphate (DCP), in both solution and gas phases, respectively. The yellow color of the BPDA solution is slowly transferred into a noticeable fuchsia-pink color for the gradual accumulation of DCP, which is visualized in the bare eye. The fuchsia-pink color of the BPDA-DCP solution is wholly reversed to the yellow color of free BPDA due to the steady addition of triethylamine (TEA). Our developed BPDA-based colorimetric sensor shows excellent selectivity towards DCP with a detection limit of 44.5 nM. Also, a paper strip and smartphone-based assay analysis have been demonstrated for the practical utility of our BPDA for immediate detection of DCP within the stockpiles of similar toxic analytes. Also, a dip-stick method has been employed to identify and quantify the DCP vapor selectively among the other analogous poisonous organophosphates.
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