Amidine-based fluorescent chemosensor with high applicability for detection of CO₂: A facile way to "see" CO₂

An amidine-based fluorescent chemosensor has been prepared and is sensitive to the viscosity increase of ionic liquid formed during a specialized reaction of amidine groups with CO₂, which provides a facile and visible way to detect and sense CO₂. It has been found that the greener fluorescent chemosensor has unique sensitivity to CO₂, extraordinarily high water-resistance and no problem of carbon monoxide-interfering.