“ICT-not-quenching” near infrared ratiometric fluorescent detection of picric acid in aqueous media

The first "off–on" and ratiometric fluorescent method based on ICT mechanism for picric acid (PA) recognition in the near infrared region was constructed. Key advantages of the unique molecular architecture can fulfil the ratiometric response to electron-deficient featured PA which inclines to quench fluorescence of all reported sensors for PA.