A novel imidazole‐derived Schiff base as selective and sensitive colorimetric chemosensor for fluorescent detection of Cu²⁺ in methanol with mixed aqueous medium

Abstract

Abstract A highly efficient, selective, sensitive, and colorimetric chemosensor SB for Cu 2+ detection with turn‐on fluorescence behavior in CH 3 –water solution was synthesized. A good enhancement of the intensity of fluorescence was detected by the incremental addition of Cu 2+ after excitation at 286 nm. The fluorescence quantum yield (Ф) of SB – Cu 2+ was calculated for 0.41. The responsive mechanism of SB to copper ion is involved for on the combined effects of C═N isomerization and intramolecular charge transfer (ICT) process and chelation‐enhanced fluorescence (CHEF). The detection limit for the fluorescent chemosensor SB toward Cu 2+ was 0.6 × 10 −6 M.