Ratiometric detection of mercury ions in water: accelerated response kinetics of azochromophores having ethynyl ligand tethers

Abstract

The metal-induced intramolecular cyclization reaction of an azo dye was exploited for the colorimetric detection of mercury ions in water. The molecular probe 3 responds selectively to nM-level Hg(II) ions in neutral aqueous solutions.

Dual-Action Polymeric Probe: Turn-On Sensing and Removal of Hg2+; Chemosensor for HSO4–

“…The detailed fluorescence spectra revealed the high effectivity of the probe P3 to detect Hg 2+ ions at biologically relevant pH 4 to 8 . It is worthwhile to mention that the time-consuming reaction of Hg 2+ with chemodosimeters become problematic for instantaneous study. , Accordingly, in our system, the time-dependence fluorescence response of P3 with Hg 2+ was also explored. The emission spectra of aqueous solution of P3 with 1 equiv of Hg 2+ were recorded at different time periods (0 to 8 min).…”

Azo Schiff bases as colorimetric and fluorescent sensors for recognition of F−, Cd2+ and Hg2+ ions

“…The selectivity for azobenzene dyes has been reported by the other authors. 23,24 By plotting the changes in H 2 L 2 in the absorbance intensity at 464 nm and 543 nm as a function of Hg 2+ and Cd 2+ concentrations, sigmoidal curves were obtained and are shown in the inset of Fig. 7a and b.…”

“…22 Cheng et al demonstrated that a series of azobenzene dye receptors showed a selective color change on addition of Cd 2+ and Hg 2+ metal ions. 23,24 This paper concerns a novel colorimetric and uorescent anion comprising a OHphenolic group (anion binding site) coupled to a phenylazo group (chromogenic and uorescence unit). The behavior of this new compound towards anions, e.g.…”

Triarylamine Rhodanine Derivatives as Red Emissive Sensor for Discriminative Detection of Ag+ and Hg2+ ions in Buffer-Free Aqueous Solutions

“…Mercury is known to affect the central nervous system, and its accumulation in the human body leads to cognitive and motor disorders . Hg 2+ ion can be detected using fluorescent sensors, ratiometric fluorescence, gated photochromism, and triple signal readout colorimetric sensing with organic chromophores and nanoparticles as a probe molecules. ,,− Most of the reported receptors are insoluble in water, and thus, the sensing needs to be carried out in the mixture of organic and aqueous solution with the percentage varying from 50:50 to 10:90 (volume/volume) ratio, which limits applications in biological microenvironments. Since most of the sensors involve complexation, an electrostatic interaction between analyte and receptors, the testing medium plays a crucial role in influencing the receptor–analyte interactions …”