A BODIPY based indicator for fluorogenic detection of salicylaldehyde with off–on emission†
Abstract
A turn-on fluorescent indicator 1 based on a BODIPY derivative for the detection of salicylaldehyde in aqueous solution by fluorescence spectroscopy has been developed. The formation of a Schiff base between probe 1 and salicylaldehyde suppressed the PET process and prohibited the CN isomerization accounting for the fluorescence response of probe 1. Two major reaction products of probe 1 with salicylaldehyde were obtained and characterized by 1H NMR and HRMS spectroscopy. Weakly fluorescent polymeric films have been obtained by embedding the indicator in PMMA, which can be used for the fluorescence detection of salicylaldehyde in polymer matrices.