Abstract: A novel fluorescent probe L (2-((E)-((2-((4-((E)-(4-nitrophenyl) diazenyl) phenyl) amino) ethyl) imino) methyl) quinolin-8-ol) for detecting Al3+ was designed and synthesized. The structure was fully characterized by elemental analyses,1H-nuclear magnetic resonance (NMR) and electron ionization-mass spectrometry (EI-MS). The fluorescence intensity of the probe was very weak in solution, but it increased obviously after binding with Al3+. Thus, a new method for the determination of Al3+ was successfully established. It exhibited a dynamic response within the Al3+ concentration range from 1 × 10-8 to 1.4 × 10-6 mol/L. The limit of detection (LOD) of the method was 5.8 × 10-9 mol/L. The recovery of the method was 96.5%–105.9% and the precision expressed as relative standard deviation (RSD) was 5.89%. The method showed the advantages of excellent selectivity, high sensitivity, wide linear range and simplicity.

Key words: synthesis, fluorescent probe, Al3+, food, detection