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Reaction‐Based Ratiometric Chemosensor for Instant Detection of Cyanide in Water with High Selectivity and Sensitivity
Author(s) -
Lin Qi,
Liu Xin,
Wei TaiBao,
Zhang YouMing
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201300791
Subject(s) - cyanide , chemistry , fluorescence , selectivity , proton nmr , detection limit , photochemistry , nucleophile , naphthalene , nucleophilic addition , analytical chemistry (journal) , inorganic chemistry , stereochemistry , chromatography , organic chemistry , catalysis , physics , quantum mechanics
A highly selective chemosensor 1 based on an acylhydrazone group as binding site and naphthalene group as the fluorescence signal group were described, which could instantly detect CN − in water with specific selectivity and high sensitivity. The detection of cyanide was performed via the nucleophilic attack of cyanide anion on the carbonyl group, which could be confirmed by 1 H NMR, 13 C NMR, ESI‐MS and DFT calculations. The addition of CN − to sensor 1 induced a remarkable color change from colorless to yellow and generated a blue fluorescence, these sense procedure could not interfered by other coexistent competitive anions (F − , Cl − , Br − , I − , AcO − , H 2 PO 4 − , HSO 4 − , ClO 4 − , SCN − , S 2− , NO 3 − and SO 4 2− ). The detection limits were 5.0×10 −7 M and 2.0×10 −9 M of CN − using the visual fluorescent color changes and fluorescence spectra changes respectively, which is far lower than the WHO guideline of 1.9×10 −6 M . Test strips based on sensor 1 were fabricated, which could act as a convenient and efficient CN − test kit to detect CN − in pure water for “in‐the‐field” measurement.