A highly sensitive and selective “turn-on” fluorescence sensor for rapid detection of cyanide ions in aqueous solution

Wei, Tai Bao; Yan, Guo Tao; Li, Hui; Zhu, Yuan Rong; Shi, Bing Bing; Lin, Qi; Yao, Hong; Zhang, You Ming

doi:10.1080/10610278.2015.1125899

Cited by 25 publications

(3 citation statements)

References 29 publications

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“…As a probe for the assigned anion, the response time is of importance to the practical detection of analytes [62]. The effect of the reaction time on the binding process of CN À to receptor L was investigated.…”

Section: Study As a Function Of Timementioning

confidence: 99%

Naked-eye detection of cyanide ions in aqueous media based on an azo-azomethine chemosensor

Orojloo

Amani

2016

Comptes Rendus. Chimie

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The optical and colorimetric properties of a new chemosensor 4-((2,4-dichlorophenyl) diazenyl)-2-(3-hydroxypropylimino)methyl)phenol (L) for cyanide ions were investigated by the naked-eye detection and UVevis spectroscopy. This receptor reveals visual changes toward CN À anions in aqueous media. No significant color changes were observed upon the addition of any other anions. The cyanide recognition properties of the receptor through proton-transfer were monitored by UVevis titration and 1 H NMR spectroscopy. The binding constant (K a ) and stoichiometry of the formed hosteguest complex were calculated by the BenesieHildebrand (BeH) plot and Job's plot method, respectively. The detection limit of the probe towards CN À was 1.03 Â 10 À6 mol L À1 , which is lower than the maximum value of cyanide (1.9 Â 10 À6 mol L À1 ) permitted by the World Health Organization in drinking water. Thus, this chemosensor was sensitive enough to detect cyanide in aqueous solutions. 1 H NMR experiments were conducted to investigate the nature of interaction between the receptor and CN À anions. Notably, the designed sensor can be applied for the rapid detection of cyanide anions in the basic pH range and also under physiological conditions, for practical purposes for a long duration. The sensing behavior of the receptor was further emphasized by computational studies. Quantum-chemical calculations and molecular studies via Density Functional Theory (DFT) were carried out to supplement the experimental results.

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Section: Study As a Function Of Timementioning

confidence: 99%

Naked-eye detection of cyanide ions in aqueous media based on an azo-azomethine chemosensor

Orojloo

Amani

2016

Comptes Rendus. Chimie

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“…Aryl and aroyl hydrazone structures formally contain both the Schiff base moiety and an amidic fragment [9,26,27,28]. These probes, known as multitopic ligands for metal-organic architectures [29] and as sensors for cations, anions, neutral molecules [30,31,32,33], undergo keto-enol tautomeric interconversion. The equilibrium between the different forms with distinct properties can be influenced by solvent polarity and pH value.…”

Section: Introductionmentioning

confidence: 99%

An Amphiphilic Pyridinoyl-hydrazone Probe for Colorimetric and Fluorescence pH Sensing

et al. 2019

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A new pH sensor based on a substituted aroylhydrazide with a flexible side chain and a terminal trimethyl ammonium group (PHA+) was designed and synthesized. The terminal quaternary ammonium guarantees excellent solubility in water. At the same time, the probe is very soluble in hydrophobic envirornments. The pyridinoyl-hydrazone moiety acts as the pH-sensitive fluorophore/chromophore probe. Extensive physicochemical characterization has been performed on the bromide salt PHABr. DFT calculations, based on single-crystal X-ray data, permitted to rationalize the optical behavior. Molecular dynamics simulations permitted to clarify the mode of interaction with lipid membrane. The ability of the probe to change color and fluorescence in response to different pH and media of different polarity has been investigated. PHABr shows a remarkable pH-dependent behavior in both absorption and fluorescence spectra with high sensitivity and strong on-off switch effect at neutral pH, perceptible even to the naked eye.

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“…The receptor was designed in such a way to have multiple anion binding sites like variety of hydroxyl groups and imine H-atoms. Such receptors would normally exhibit high selectivity towards a particular anion [26].…”

Section: Introductionmentioning

confidence: 99%

Highly selective turn-on fluorescent probe for detection of cyanide in water and food materials

Mahalakshmi

SaravanaKumar

Rajalakshmi

et al. 2019

Methods Appl. Fluoresc.

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A naphthoquinone-imine based fluorescent probe (R) has been synthesized and characterized by NMR and mass spectral techniques. The receptor shows high selectivity towards cyanide in water in the presence of other competitive anions with an instantaneous colour change from non-emissive to green under UV light. The turn-on fluorescence is due to deprotonation of three hydroxyl groups by cyanide ions as evidenced from 1 H NMR titration experiment. The LOD of cyanide by R in water is 0.6 μM, which is much lower than the permissible limit of cyanide in drinking water according to the WHO.

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A highly sensitive and selective “turn-on” fluorescence sensor for rapid detection of cyanide ions in aqueous solution

Cited by 25 publications

References 29 publications

Naked-eye detection of cyanide ions in aqueous media based on an azo-azomethine chemosensor

Naked-eye detection of cyanide ions in aqueous media based on an azo-azomethine chemosensor

An Amphiphilic Pyridinoyl-hydrazone Probe for Colorimetric and Fluorescence pH Sensing

Highly selective turn-on fluorescent probe for detection of cyanide in water and food materials

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