A new fluorescent chemosensor for Hg²⁺ in aqueous solution

Abstract

We prepared an aminothiourea-derived Schiff base (DA) as a fluorescent chemosensor for Hg(2+) ions. Addition of 1 equiv of Hg(2+) ions to the aqueous solution of DA gave rise to an obvious fluorescence enhancement and the subsequent addition of more Hg(2+) induced gradual fluorescence quenching. Other competing ions, including Pb(2+), Cd(2+), Cr(3+), Zn(2+), Fe(2+), Co(3+), Ni(2+), Ca(2+), Mg(2+), K(+) and Na(+) , did not induce any distinct fluorescence changes, indicating that DA can selectively detect Hg(2+) ions in aqueous solution.

Fluorescent, colourimetric, and ratiometric probes based on diverse fluorophore motifs for mercuric(II) ion (Hg2+) sensing: highlights from 2011 to 2019

“…Quang reported the synthesis of the ICT aminothiourea-derived Schiff base, Hg-41 ( Fig. 35), for the fluorescent recognition of Hg 2+ (Quang et al 2013). In aqueous solution, the addition of Hg 2+ to the probe's solution pushed the fluorescence intensity upward at about 30% increment.…”

Isatin‐Triazole‐Functionalized Rhodamine: A Dual Sensor for Cu2+ and Fe3+ Ions and Its Application to Cell Imaging

“…Several fluorescent metal sensors containing BODIPY, coumarin, napthlamide, thiazolo‐pyridine, dihydropyridine/pyridine and rhodamine derivatives have been developed for sensing of Cu 2+ and Fe 3+ ions . Among them, rhodamine B frameworks have received tremendous attention as chemosensors as they possess excellent photophysical properties, large extinction coefficient, high photostablity and high fluorescence quantum yield . The mechanism of detection is particularly based on the structural changes between the closed spirolactam form and opened amide linkage of rhodamine framework.…”

Using calculations of the electronically excited states for investigation of fluorescent sensors: A review

“…Fluorescent sensors are based on the transforms of fluorescence signal resulting from the interaction of the analytes with sensors. During the sensing process, there is a change in intensity from weak or non-fluorescence to strong fluorescence, [1][2][3] or vice versa; [4][5][6] or a shift in maximum fluorescence wavelength. [7][8][9] Fluorescent sensor is called a chemosensor when its reaction with a specific analyte is reversible.…”