Discriminating Chemosensor for Detection of Fe3+ in Aqueous Media by Fluorescence Quenching Methodology

[摘要] The Schiff base as chemosensor (B) namely 2‐((anthracen‐1‐ylimino) methyl) phenol was designed and synthesized. The spectral properties of chemosensor B were confirmed by using IR, 1H NMR, 13C NMR, and LC–MS techniques. The chemosensor B shows a significant fluorescence quenching with incremental addition of Fe3+. The present chemosensor B shows unaffected fluorescence response induced by Fe3+ even in the presence of other competing ions in mixed solvent system. The binding mode and stoichiometry (2:1) between chemosensor B and Fe3+ were analyzed by recording 1H NMR and Job's plot respectively. The ground state complexation of chemosensor B and Fe3+was confirmed by absorption titration and fluorescence lifetime measurement in the absence and presence of various concentration of Fe3+ ion to chemosensor B. The lower detection limit for Fe3+ found to be 0.59 μM with correlation coefficient R2 = 0.9815. The present chemosensor B successfully applied for quantitative determination of the Fe3+ ion from ordinary water samples.

[学科分类] 化学（综合）

[关键词] Schiff base;Iron ion;Fluorescence quenching;Job's plot;Ground state complex