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Receptor with an Active Methylene Group as Binding Site for Extraction of Inorganic Fluoride Ions from Seawater
Author(s) -
Trivedi Darshak R.
Publication year - 2014
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201402018
Subject(s) - deprotonation , seawater , chemistry , fluoride , methylene , titration , extraction (chemistry) , ion , detection limit , aqueous solution , inorganic chemistry , nuclear chemistry , medicinal chemistry , organic chemistry , chromatography , geology , oceanography
Abstract Two new receptors R1 and R2 based on triphenylphosphonium salts with an active methylene group as binding site have been designed and synthesised for the detection of F − ions. The detection limit of these receptors in organic media was found to be 0.2 ppm. Upon adding F − ions, a Δ λ max of 188 nm and 256 nm was observed for receptors R1 and R2 , respectively. The detection process followed deprotonation of the methylene proton, which has been confirmed by 1 H NMR titration. The receptors were evaluated for real‐life applicability by extracting F − ions from aqueous media and seawater into organic media. Receptor R2 was able to extract F − ions from seawater with 99 % efficiency. The level of F − ions present in seawater has been quantified and found to be 1.4 ppm, which is comparable to the reported literature value.