Journal ArticleDOI
Chromogenic oxazines for cyanide detection.
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TLDR
The mechanism and compounds for the colorimetric identification of cyanide can lead to the development of practical strategies for the convenient determination of this toxic anion in aqueous environments.Abstract:
We have designed two heterocyclic compounds for the colorimetric detection of cyanide. The skeleton of both molecules fuses a benzooxazine ring to an indoline fragment and can be assembled efficiently in three synthetic steps starting from commercial precursors. The two compounds differ in the nature of the substituent on the carbon atom at the junction of the fused heterocycles, which can be either a methyl or a phenyl group. In the presence of cyanide, both molecules are converted quantitatively into cyanoamines with the concomitant appearance of an intense band in the visible region of the absorption spectrum. The developing absorption is a result of the opening of the benzooxazine ring with the formation of a 4-nitrophenylazophenolate chromophore. Nuclear magnetic resonance spectroscopy and X-ray crystallographic analyses demonstrate that the covalent attachment of a cyanide anion to the indoline fragment is responsible for these transformations. The chromogenic process is particularly fast for the me...read more
Citations
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Sensors for the optical detection of cyanide ion
TL;DR: This tutorial review focuses on recent developments arising from studies of optical sensors for cyanide ions, which are categorized by approaches involving cyanide selective receptors, the utilization of metal coordinated complexes, and chemodosimeters.
Journal ArticleDOI
Sub-nanometre sized metal clusters: from synthetic challenges to the unique property discoveries
Yizhong Lu,Wei Chen +1 more
TL;DR: In this critical review, recent advances in sub-nanometre sized metal clusters (Au, Ag, Cu, etc.) including the synthetic techniques, structural characterizations, novel physical, chemical and optical properties and their potential applications are discussed in detail.
Journal ArticleDOI
Applications of Supramolecular Anion Recognition
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Fluorescent Chemodosimeter for Selective Detection of Cyanide in Water
TL;DR: A coumarin-based fluorescent chemodosimeter with a salicylaldehyde functionality as a binding site has been developed for selective detection of cyanide anions over other anions in water at biological pH.
Journal ArticleDOI
Molecular switches as photocontrollable “smart” receptors
Manuel Natali,Silvia Giordani +1 more
TL;DR: This critical review focuses on the development of photochromic compounds as sensors for cations, anions, and biologically important molecules and a summary of photoswitchable receptors emerged to date and classified according to the photo chromic structure they are based on.
References
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TL;DR: This report describes the current progress of the use of noncovalently attached indicators to signal binding of analytes in synthetic sensors, and includes previous examples.
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