A Rapid, Highly Sensitive and Selective Phosgene Sensor Based on 5,6-Pinenepyridine.

Area of Science:

• Chemical sensing
• Analytical chemistry
• Organic synthesis

Background:

• Phosgene (COCl2) is a highly toxic industrial chemical.
• Rapid and accurate detection of phosgene is crucial due to its hazardous nature and widespread industrial applications.

Purpose of the Study:

• To develop a novel sensor for the colorimetric and fluorimetric detection of phosgene.
• To utilize a unique pyrido-[2,1-a]isoindolone formation for phosgene sensing.

Main Methods:

• Synthesis of a carboxylic derivative of 5,6-pinenepyridine.
• Application of the derivative as a sensor in solution and on a solid support.
• Evaluation of sensing performance including speed, selectivity, sensitivity, and limit of detection.

Main Results:

• The sensor exhibits extremely fast (under 5 seconds), selective, and highly sensitive detection in solution with a limit of detection (LOD) of 9.7 nM/0.8 ppb.
• When immobilized on a solid support, the sensor detects gaseous phosgene at concentrations as low as 0.1 ppm.
• This represents one of the lowest detection limits reported for gaseous phosgene sensors.

Conclusions:

• A novel pyrido-[2,1-a]isoindolone-forming sensor for phosgene has been successfully developed.
• The sensor demonstrates excellent performance characteristics for both solution-based and air monitoring applications.
• This advancement offers a promising tool for enhanced safety in chemical industries handling phosgene.