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A Chemodosimetric Probe Based on a Conjugated Oxidized Bis‐Indolyl System for Selective Naked‐Eye Sensing of Cyanide Ions in Water
Author(s) -
Kumari Namita,
Jha Satadru,
Bhattacharya Santanu
Publication year - 2012
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.201200565
Subject(s) - cyanide , chemistry , naked eye , adduct , moiety , conjugated system , ion , photochemistry , mass spectrometry , spectroscopy , inorganic chemistry , organic chemistry , detection limit , chromatography , physics , quantum mechanics , polymer
A new bis‐indolyl‐based colorimetric probe has been synthesized. This allows a Michael‐type adduct formation for the detection of cyanide ions. The probe shows a remarkable color change from red to colorless upon addition of the cyanide ions in pure water. The cyanide ion reacts with the probe and removes the conjugation of the bis‐indolyl moiety of the probe with that of the 4‐substituted aromatic ring. This renders the probe colorless. The mechanism of the reaction of the probe with the cyanide ion was established by using 1 H and 13 C NMR spectroscopy, mass spectrometry, and kinetic studies.