Receptor with an Active Methylene Group as Binding Site for Extraction of Inorganic Fluoride Ions from Seawater. Issue 7 (16th April 2014)

• Record Type: Journal Article
• Authors: Madhuprasad, ; Trivedi, Darshak R.
• Is Part Of: ChemPlusChem. Volume 79:Issue 7(2014:Jul.)
• Page Start: 1001
• Page End: 1008
• Publication Date: 2014-04-16
• Subjects: colorimetry -- extraction -- fluoride -- receptors -- water chemistry; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201402018
• Languages: English
• ISSNs: 2192-6506

Abstract

Abstract: Two new receptors R1 andR2 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 andR2, 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. Abstract : Watercolors : A receptor based on a triphenylphosphonium salt that contains an active methylene group has been designed and synthesized for the colorimetric detection and extraction of F − ions from seawater with 99 % efficiency. The process results in an instantaneous color change (see figure).