Specific optical signalling of anions via intramolecular charge transfer pathway based on acridinedione fluorophore

摘要

We present a simple but highly specific acridinedione fluorophore (ADD-1) that acts both as a fluorescent and colorimetric sensor for anions in acetonitrile. The specific optical signalling of ADD-1 is due to the formation of new distinct intramolecular charge transfer (ICT) emitting states in the presence of AcO~- (490nm), H_2PO_4~- (440nm), and F~- (510nm) over other anions. Presence of F~- shows a colour change that is perceptible to the naked eye, from colourless to an intense fluorescent green due to the deprotonation of acridinedione ring amino hydrogen.