Discriminating Chemosensor for Detection of Fe~(3+) in Aqueous Media by Fluorescence Quenching Methodology

摘要

The Schiff base as chemosensor (B) namely 2-((anthracen-l-ylimino) methyl) phenol was designed and synthesized. The spectral properties of chemosensor B were confirmed by using IR, ~1H NMR, ~(13)C NMR, and LC-MS techniques. The chemosensor B shows a significant fluorescence quenching with incremental addition of Fe~(3+). The present chemosensor B shows unaffected fluorescence response induced by Fe~(3+) even in the presence of other competing ions in mixed solvent system. The binding mode and stoichiome-try (2:1) between chemosensor B and Fe~(3+) were analyzed by recording ~1H NMR and Job's plot respectively. The ground state complexation of chemosensor B and Fe~(3+)was confirmed by absorption titration and fluorescence lifetime measurement in the absence and presence of various concentration of Fe~(3+) ion to chemosensor B. The lower detection limit for Fe~(3+) found to be 0.59 uM with correlation coefficient R~2 = 0.9815. The present chemosensor B successfully applied for quantitative determination of the Fe~(3+) ion from ordinary water samples.