2016
DOI: 10.1039/c5ay03178h
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Novel chromogenic selective sensors for aqueous cyanide ions under high water content and real sample analysis

Abstract: Novel chromogenic receptors (R1–R2) containing anthraquinone as the signalling unit and imidazole as the binding unit were designed to enhance the sensing action in an aqueous medium.

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Cited by 33 publications
(9 citation statements)
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“…The UV–vis titration studies of DTPH were performed with 10 –5 M sensor solution prepared in ACN and 10 –4 M CN – solution prepared in 9:1 ACN–H 2 O medium. Here, the occurrence of water probably inhibited the deprotonation upon addition of CN – . , From the absorption spectra, it was shown that the free sensor exhibited two peaks at 255 and 300 nm corresponding to the π–π* and n−π* transition, respectively, and the π–π* transition also corroborated with the time-dependent density functional theory calculation (Figure S13; Supporting Information). Upon steady addition of CN – to the sensor, a new peak was noticed to be emerged at 480 nm with simultaneous diminution of the initial peak and upsurge of the peak at 300 nm, affirming an charge-transfer transition within the −NH moiety of the sensor and CN – (Figure a).…”
Section: Resultssupporting
confidence: 62%
See 1 more Smart Citation
“…The UV–vis titration studies of DTPH were performed with 10 –5 M sensor solution prepared in ACN and 10 –4 M CN – solution prepared in 9:1 ACN–H 2 O medium. Here, the occurrence of water probably inhibited the deprotonation upon addition of CN – . , From the absorption spectra, it was shown that the free sensor exhibited two peaks at 255 and 300 nm corresponding to the π–π* and n−π* transition, respectively, and the π–π* transition also corroborated with the time-dependent density functional theory calculation (Figure S13; Supporting Information). Upon steady addition of CN – to the sensor, a new peak was noticed to be emerged at 480 nm with simultaneous diminution of the initial peak and upsurge of the peak at 300 nm, affirming an charge-transfer transition within the −NH moiety of the sensor and CN – (Figure a).…”
Section: Resultssupporting
confidence: 62%
“…The foremost mechanism which can elicit an obvious color change of a sensor molecule by the interaction with an anionic species is the charge–transfer transitions, which triggers the alteration of the spectroscopic characters of the sensor and consequently changes its UV–vis spectrum . Moreover, the lesser hydration energy (Δ H hyd = −67 kJ mol –1 ) of CN – than that of F – (Δ H hyd = −505 kJ mol –1 ), AcO – (Δ H hyd = −375 kJ mol –1 ), and H 2 PO 4 – (Δ H hyd = −260 kJ mol –1 ) further helps to selectively recognize CN – in the pool of others competitive anions. ,, …”
Section: Introductionmentioning
confidence: 99%
“…The overall electron density around BDC is significantly enhanced that further causes a reduction in the energy gap between the molecular orbital of BDC; thus, the appearance of a new band occurs at a higher wavelength accompanied by a color change from pale yellow to dark brown. 57 Herein, −NO 2 as an electron-pulling chromophore was purposefully incorporated to increase the acidity of the amide protons and also the hydrogen-donor properties of the chemoreceptor. 58 The response of the chemoreceptor BDC toward the other environmentally encountered anions has been investigated (Figure S13 in the Supporting Information).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…Owing to this, a partial positive charge is developed on the −NH unit of BDC and a negative one on the N atom of the CN – molecule that furthermore facilitates the charge transfer process owing to the push–pull effect. The overall electron density around BDC is significantly enhanced that further causes a reduction in the energy gap between the molecular orbital of BDC ; thus, the appearance of a new band occurs at a higher wavelength accompanied by a color change from pale yellow to dark brown . Herein, −NO 2 as an electron-pulling chromophore was purposefully incorporated to increase the acidity of the amide protons and also the hydrogen-donor properties of the chemoreceptor .…”
Section: Resultsmentioning
confidence: 99%
“…The adverse health consequences of ions such as cyanide, are well documented such as complications of vascular, visual, central nervous, cardiac, endocrine and metabolic systems. [1][2][3][4][5][6][7][8] Chemically, cyanide ion is a resilient nucleophile, sufficiently basic in nature, and can act as an ambidentate ligand and most importantly a pseudohalide. Cyanide is chosen as an exemplar since it nds widespread application in metallurgy, mining, electroplating and polymer synthesis.…”
Section: Introductionmentioning
confidence: 99%