Fluorescent Probe For Mercury Research Articles

Synthesis and Application of a Naphthol‐Based Fluorescent Probe for Mercury(II) Detection

AbstractA sensitive analytical method for detecting trace levels of mercury(II) in diverse samples is desperately needed owing to its notoriously toxic. In this study, we have developed a novel fluorescent probe 2,2′‐((6‐hydroxynaphthalen‐2‐yl) methylene) bis (sulfanediyl) diacetic acid (Probe 1) for the sensitive detection of Hg2+. Probe 1 could detect Hg2+ content in CH3CN/buffer (pH 6.0) solution. Probe 1 has a low detection limit (1.34 nM) and the detection range was 0–8 μM. The luminescent intensity of Probe 1 in a CH3CN/buffer (pH 6.0) solution increased with the concentration of Hg2+ over two minutes, as observed under a 254 nm UV lamp. Furthermore, this phenomenon was observed using test papers of Probe 1. Importantly, Probe 1 could detect Hg2+ in wheat, mineral water, rice, tap water, and kelp samples.

Nitrogen doped graphene quantum dots as a fluorescent probe for mercury(II) ions.

A highly selective fluorescent probe for Hg2+ is reported. It consists ofnitrogen doped graphene quantum dots (NGQDs) that are nearly sphericalin shape, have an average diameter of 2.7nm and excitation-independent emission. The bluefluorescence of the NGQDs (with maximum excitation/emission at 378/447nm) is quenched by Hg2+ due to both dynamic and static quenching. The probe has a wide detection range (2.5μM - 800μM) and a limit of detection of 2.5μM. The dynamic andstaticquenching constants are 417M-1 and 63500M-1, respectively. The probe was used to quantfy Hg2+ in spiked real water samples with satisfactory results. Graphical abstract ᅟ.

Boron-doped graphitic carbon nitride as a novel fluorescent probe for mercury(ii) and iron(iii): a circuit logic gate mimic

Boron-g-C3N4 was applied as a novel practical fluorescent probe to detect mercury and ferric ions in real samples.

Water-soluble polymer dots formed from polyethylenimine and glutathione as a fluorescent probe for mercury(II).

Water-soluble fluorescent polymer dots (PDs) were prepared from polyethylenimine and glutathione and are shown to be viable fluorescent probes for selective and sensitive determination of Hg(II). The PDs possess bright blue fluorescence (with excitation/emission peaks at 340/462nm) which is quenched on addition of Hg(II). Based on these findings, a fluorometric assay was worked out. Fluorescence linearly drops in the 0.1 to 100μM Hg(II) concentration range, and the limit of detection is 32nM. Graphical abstract The fluorescence of polymer dots prepared from glutathione and polyethyleimine (G-PEI PDs) is selectively quenched by Hg2+,and this finding was applied to thedetermination of Hg2+ in environmental water samples.

"Turn-On" Fluorescent Probe for Mercury(II): High Selectivity and Sensitivity and New Design Approach by the Adjustment of the π-Bridge.

By intelligent design, a new "turn-on" fluorescent probe (1-CN) was obtained based on the deprotection reaction of the dithioacetal promoted by Hg2+ ions, which could sense mercury ions sensitively and selectively, with the detection limit of 8×10(-7) M. Thanks to the apparent turn-on signal, 1-CN has been successfully applied to rapidly detect trace amounts of mercury ions as test strips and cell image.

Porphyrin-based electrostatically self-assembled multilayers as fluorescent probes for mercury(ii) ions: a study of the adsorption kinetics of metal ions on ultrathin films for sensing applications

ESAM as fluorescent probes for Hg(ii) ions were developed. The adsorption process involved in analyte-solid probe interaction was studied by monitoring fluorescence quenching.

Thioether-tethered bisquinoline derivatives as fluorescent probes for mercury(ii) and iron(iii) ions

Three ethanedithiol-linked bisquinoline derivatives with a different number of methoxy substituents on the aromatic ring exhibit a significant fluorescent response toward mercury(II) and iron(III) ions. Fluorescence enhancement (OFF–ON), ratiometric and fluorescence quenching (ON–OFF) responses were achieved with the same molecular skeleton, by changing the methoxy substitution pattern.

2-(2′-Hydroxyphenyl)-4(3H)-quinazolinone derivatives based fluorescent probes for mercury(II) via an intramolecular proton transfer mechanism

2-(2′,5′-Dihydroxy-phenyl)-4(3H)-quinazolinone (DHPQ), a new fluorescent dye that exhibits excited state intramolecular proton transfer (ESIPT) reaction and possesses good photophysical properties, is synthesised and used as fluorescent probe for detection of Hg2+. Mercuric ions can be detected and quantitated by measuring the fluorescent intensity decrease of the probe. The decrease of fluorescence intensity of DHPQ upon the addition of Hg2+ was attributed to the blocking of ESIPT reactions of DHPQ and quenching its fluorescence. The analytical performance characteristics of the proposed Hg2+ probe were investigated. The probe can be applied to the quantification of Hg2+ with a concentration range covering from 8.0 × 10−7 to 2.0 × 10−4 mol L−1, with a working pH range of 5.5–6.5. It shows excellent selectivity for Hg2+ over other transition metal cations. The proposed method was testified for the Hg2+ assay in river water samples with satisfying recoveries.

New fluorescent probes for mercury(II) with simple structure

Based on the protection reaction between ethanethiol and aldehyde, a novel fluorescent probe ( 2) for Hg 2+ ions, with the simplest structure reported so far, was designed, which displayed high sensitivity and selectivity towards Hg 2+ and Ag + over other metal ions with detectable fluorescent signals, due to distinct deprotection reaction of dithioacetal. Compound 2 was further utilized to construct the chemical reaction-based conjugated polymer probes ( P2 and P4) for Hg 2+ ions. More importantly, the effect of the molecular weight of conjugated polymers on the sensitivity of the probes towards Hg 2+ ions was carefully studied.

Oxidation-Resistant Fluorogenic Probe for Mercury Based on Alkyne Oxymercuration

Mercury continues to be a major safety hazard to the general public. Therefore, a fluorescence method that has potential for on-site use can be very useful. Most fluorescent probes for mercury are based on the interaction between mercury ions and sulfur atoms, which may not be compatible with mercury samples prepared by oxidation processes. Herein we report a fluorogenic probe for mercury based on the unique ability of Hg2+ to convert an alkyne to a ketone. By this methodology, the probe, prepared in two steps in 80% overall yield, is converted to a very bright green fluorescent molecule by Hg2+ in pH 7 buffer. This fluorescence method is sensitive, showing a signal-to-background ratio of 3 at 8 ppb mercury level, and highly specific for this metal ion. Since this detection method does not rely on mercury−heteroatom interactions, the probe is resistant to oxidants and thus can be used against mercury samples prepared by oxidative procedures. We demonstrate that our method can be applied to fish and dental...