Single chemosensor for multiple analytes: chromogenic and fluorogenic detection for fluoride anions and copper ions

A o-hydroxybenzoyl-(N-butyl-4,6-naphthamimide) hydrazone (1) has been synthesized. Compound 1 displayed high selectivity for F− and Cu2+ with UV/vis absorption and fluorescence spectra, respectively. In the presence of F−, while the absorption peak of 1 showed the red shift, its fluorescent intensity decreased due to deprotonation interaction. In the presence of Cu2+, both the absorption and fluorescence peaks decreased because of the coordination interaction.