Design of a novel Schiff-base fluorescent sensor for Al3+: experimental and computational studies

Abstract

Upon the gradual addition of Al³⁺ to a solution of HL, the sensor showed a large fluorescence enhancement at 420 nm. The reason for this phenomenon is that the addition of Al³⁺ to the solution of HL results in the formation of a 1 : 1 stoichiometry of the binding mode of L–Al which inhibits photoinduced electron transfer (PET).