Abstract
Based on salicylaldehyde unit, we designed and synthesized a novel fluorescent chemical probe DSS, which has a flexible long chain and contains ten methylene units. The experimental results showed that the fluorescent probe DSS can efficiently and selectively recognize Cr2O72− anions, having a detection limit LOD of 1.14 × 10−7 M. Additionally, the binding constant (Ka) of the probe was 3.75 × 104 M−1, the minimum quantification limit LOQ was as low as 3.82 × 10−7 M. We systematically studied the recognition mechanism of fluorescence chemical sensor DSS through fluorescence and UV visible spectroscopy. Significantly, the fluorescence of the chemosensor DSS can be remarkably quenched by Cr2O72−via the Internal Filtering Effect (IFE). Based on this phenomenon, a novel salamo-like fluorescence method for detection of Cr2O72− was established. The proposed fluorescent method was successfully applied to the detection of Cr2O72− in rainwater, tap water, and Yellow River water.
Published Version
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