A novel coumarin-derived dithioacetal chemosensor for trace detection of Hg²⁺ in real water samples

Abstract

A novel coumarin-derived dithioacetal chemosensor, 8-(1,3-dithian-2-yl)-7-hydroxy-4-methylcoumarin (LS), has been designed and synthesized. The sensor LS showed highly selective fluorescent sensing for Hg2+ with a low detection limit of 0.81 nM in the pH range from 6.15 to 9.96 in ethanol/water (1:1, v/v) solution. The sensing mechanism of LS toward Hg2+ was proposed and verified by 1H nuclear magnetic resonance spectroscopy studies. Under an ultraviolet lamp, the fluorescence color changes could be easily detected by the naked eye. In addition, the sensor LS has been applied in the trace detection of Hg2+ in real water samples.

Coumarin‐based Chemosensors for Metal Ions Detection

“…Fan and others developed a novel fluorescent "on-off" chemosensor, SC42, [108] based on coumarin for selective detection of Hg 2 + with very low LOD of 0.81 nM in between the pH range of 6.15-9.96 in ethanol/water solution (1 : 1, v/v). It was synthesized by adding thioacetal group to a coumarin derivate as shown in Scheme 56.…”

“…Proposed sensing mechanism between sensor SC42 and Hg 2 + . [108] Scheme 58. Synthetic route of SC43 .…”

“…[ [104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123] 9.…”

“…Synthetic route of SC42 . [108] yl)ethanesulfonic acid (a) in presence of MeOH and piperidine as shown in Scheme 58. The Hg 2 + ion was prepared from HgCl 2 in HEPES-DMSO (99 : 1, v/v; pH 7.0) solvent.…”