A new Dual-Channel Chemosensor Based on Chemodosimeter Approach for Detecting Cyanide in Aqueous Solution: a Combination of Experimental and Theoretical Studies

Abstract

A new colorimetric and fluorescent receptor 1 for the detection of CN(-) has been simply developed. Receptor 1 showed selectively colorimetric and fluorometric responses to CN(-) in a near-perfect aqueous solution, respectively. This sensor displayed an obvious color change from yellow to colorless upon selective binding with CN(-). In addition, it could function as an "OFF-ON type" fluorescent response through a nucleophilic addition mechanism. The binding mode of receptor 1 with CN(-) was proposed to be 1:1, based on Job plot, (1)H NMR titration and ESI-mass spectrometry analysis. Moreover, the sensing mechanism for CN(-) was theoretically supported by DFT and TD-DFT calculations.

An imine-based colorimetric chemodosimeter for the detection of hypochlorite $$(\hbox {ClO}^{-})$$ in aqueous media: its application in test strips and real water samples

“…[33][34][35] Chemodosimeter is a molecular probe that recognizes analytes with the irrevocable process. [36][37][38][39][40] It has the advantage of high selectivity with little interference of other anions, so it has been frequently studied in anion sensing area. [41][42][43][44][45] Despite its advantage, it still encounters some problems such as poor detection limit and slow reaction in aqueous media.…”

Pyrazolo[1,5-a]pyrimidinium Salts for Cyanide Sensing: A Performance and Sustainability Study of the Probes

“…16 Because the detection of CN − through spectrophotometry involves simple, essentially inexpensive, and easy to miniaturize instruments, this technique is generally the most popular, with nucleophilic addition to an electrophilic center of the molecular probechemosensor or chemo-dosimeterbeing the most studied methodology. 9−12 Chemodosimeters are highly selective sensors based on irreversible reactions with the analyte; 17,18 probes in the anion sensing area, knowing that most sensors reported are irreversible or come without a reversibility study.…”

“…Thus, several established and emerging analytical techniques have been evaluated for this purpose, including spectrophotometry, − fluorometry, , atomic absorption spectrometry, electrochemistry, mass spectrometry, and gas chromatography . Because the detection of CN – through spectrophotometry involves simple, essentially inexpensive, and easy to miniaturize instruments, this technique is generally the most popular, with nucleophilic addition to an electrophilic center of the molecular probechemosensor or chemodosimeterbeing the most studied methodology. − Chemodosimeters are highly selective sensors based on irreversible reactions with the analyte; , they are the most common probes in the anion sensing area, knowing that most sensors reported are irreversible or come without a reversibility study.…”

Optical Sensing and Supramolecular Cyanide Recognition Sites of Salophenes as Molecular Tweezers: The First Example of Recognition via Intramolecular Aldimine Condensation Cyclization

“…Accordingly, imine groups in the structure of S1-S8 have been activated through the resonance-assisted hydrogen bonds for nucleophilic addition of CN¯. [11][12][13][14][15][16][17] In contrast, CN¯ sensing of S9-S13 is taken place via the deprotonation of hydroxyl groups in which imines are inert to sensing. [18][19][20][21][22] Salophenes are known Schiff base ligands for the coordination with various metal ions.…”