ISSN 0253-2778

CN 34-1054/N

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A Schiff base fluorescence probe for Cu2+ ion in CH3CN/H2O

  • A Shiff base (2′4′-dihydroxyl phenylideneimino)-2-naphthol (L) was synthesized from 1-amino-2-naphthol and 2,4-dihydroxybenzaldehyde. The aim compound was characterized by FT-IR, HNMR and ESI-MS. In the solution of V(CH3CN):V(HEPES)=1:1 at pH 7.2, the fluorescence responses of L to many metal ions (Cu2+, Hg2+, Ag+, Pb2+, Cd2+, Zn2+, Ni2+, Co2+, Fe2+, Al3+, Mn2+, Ca2+, Mg2+, K+, Na+) were studied. The results indicate that L displays a fluorescence quenching for Cu2+ with good selectivity and without obvious interferences by other metal ions. In the concentration range of Cu2+ from 0 to 25×10-5 mol/L, the fluorescence intensity of this solution shows a good linear relationship with the concentration of Cu2+. Based on this curve, the binding constant between L and Cu2+ is 333×104 L/mol, and the detection limit of L for Cu2+is calculated to be 4.92×10-7 mol/L.In natural water, L also shows a good linearity with Cu2+ in the concentration range of Cu2+ from 0 to 25×10-5 mol/L.
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