A new indole-based compound N-(pyridine-2-ylmethyl)-1Hindole-2-carboxamide (FL) which could selectively recognize Al 3 + had been designed, synthesized and evaluated. FL could detect Al 3 + with high sensitivity. The fluorescence intensity of FL-Al 3 + solution was linear dependence to the concentration of Al 3 + in the ranges from 0 to 5 μmol/L. The addition of Al 3 + caused quenching of fluorescence intensity and the limit of detection for Al 3 + was as low as 1.79 × 10 À 9 M. The binding ratio of FL-Al 3 + was obtained 3:2 by Job's plot and the binding constant was 9.37 × 10 5 . Moreover, FL had been successfully applied in real sample detection.[a] J.
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