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A Reaction‐Based Colorimetric Fluoride Probe: Rapid “Naked‐Eye” Detection and Large Absorption Shift
Author(s) -
Cheng Xiaohong,
Li Shuang,
Xu Guohua,
Li Conggang,
Qin Jingui,
Li Zhen
Publication year - 2012
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201200106
Subject(s) - chemistry , fluoride , naked eye , intramolecular force , absorption (acoustics) , photochemistry , detection limit , azobenzene , selectivity , ion , dipstick , inorganic chemistry , molecule , stereochemistry , organic chemistry , optics , chromatography , catalysis , urine , biochemistry , physics
Taking advantage of both the well‐known azobenzene structure and the special fluoride‐promoted cleavage reaction of the SiO bond, a new ratiometric colorimetric probe ( F‐1 ) toward the fluoride anion was designed and synthesized by using intramolecular charge transfer (ICT) as a signal mechanism. Upon the addition of F − ions, the probe displayed apparent color changes from colorless to deep blue, with a dramatic shift of the maximum absorption wavelength (≈230 nm). With the aid of UV/Vis measurements, the detection limit could be as low as 15 μ M . The probe possessed much higher selectivity for fluoride over other common anions. Excitingly, by virtue of a “dipstick” approach, F‐1 could serve as colorimetric probe for convenient measurements, without the requirement of any additional equipment.