Salicylaldehyde-Based ‘Turn-off’ Fluorescent Chemosensor with High Selectivity for Fe3+ in H2O-DMF Solution

Abstract

An easily available fluorescent sensor (L) based on salicylaldehyde has been investigated in this work. Chemosensor (L) was exhibited highly selective and sensitive fluorescence sensing ability for Fe³⁺ over other metal ions in H₂O-DMF solution. The fluorescence quenching response of (L) for Fe³⁺ indcated that (L) can be used as “turn-off” fluorescent chemosensor to selectively detect Fe³⁺. The fluorescent sensor (L) was synthesized by the one pot condensation reaction of 2-[3-(2-formyl phenoxy)propoxy]benzaldehyde and 2-aminobenzenethiol in a 1 : 2 molar ratio and characterized by IR, NMR spectroscopy and elemental analysis.