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: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201402018
• Languages: English
• ISSNs: 2192-6506

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Two new receptors <bold>R1</bold> and <bold>R2</bold> 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<italic>λ</italic>_max of 188 nm and 256 nm was observed for receptors <bold>R1</bold> and <bold>R2</bold>, respectively. The detection process followed deprotonation of the methylene proton, which has been confirmed by ¹H NMR titration. The receptors were evaluated for real‐life applicability by extracting F⁻ ions from aqueous media and seawater into organic media. Receptor <bold>R2</bold> 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.</p> </abstract>