A novel selective “turn-on’’ fluorescent sensor for Hg2+ and its utility for spectrofluorimetric analysis of real samples

Abstract

A novel anthracene-based dipodal Schiff base ''turn-on'' fluorescent sensor (FS) was designed and synthesized by accessible and straightforward Schiff base reaction of salicylaldehyde and 9,10-bis(aminomethyl)anthracene with high yield. The chemical characterization of fluorescent sensor FS was performed by standard spectroscopic techniques (MALDI-MS, FT-IR, 1 H, and 13 C NMR), and photophysical properties were exanimated by UV-vis and fluorescent spectroscopies. The fluorescent sensor FS can coordinate with Hg 2+ via Schiff base moiety when analytical signal as a "turn on" fluorescent response was obtained via anthracene moiety after coordination. Also, spectrofluorimetric analysis of Hg 2+ was carried out using fluorescent sensor FS in environmental water samples after optimization required experimental conditions such as pH, the time before measurements, and photostability. According to obtained results, the presented fluorescent sensor can be used for selective and sensitive spectrofluorimetric determination of Hg 2+ .

A Fluorescent Polymer Coated Sensor Chip for Mercury Ion (Hg2+) Determination in Lake Water

“…Using DNS-EMA as a metal cation recognition unit, six PCFCs (PCFC1-PCFC6) were prepared as a fluorescent sensor for Hg 2 + determination in water. In comparison to fluorescent sensors based on molecules, [24] such as Schiff bases [25] thiocarbohydrazide, [24] chip-based sensors have advantages such as reproducibility and reversibility. [26] The sensor chip, an optimized PCFC6, responds only to Hg 2 + and not to other representative metal cations.…”