A Novel Imidazole-Derived Schiff Base As Selective And Sensitive Colorimetric Chemosensor For Fluorescent Detection Of Cu2+ In Methanol With Mixed Aqueous Medium

A highly efficient, selective, sensitive, and colorimetric chemosensor SB for Cu2+ detection with turn-on fluorescence behavior in CH3-water solution was synthesized. A good enhancement of the intensity of fluorescence was detected by the incremental addition of Cu2+ after excitation at 286 nm. The fluorescence quantum yield (CYRILLIC CAPITAL LETTER EF) of SB-Cu2+ was calculated for 0.41. The responsive mechanism of SB to copper ion is involved for on the combined effects of CN isomerization and intramolecular charge transfer (ICT) process and chelation-enhanced fluorescence (CHEF). The detection limit for the fluorescent chemosensor SB toward Cu2+ was 0.6 x 10(-6) M.