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Synthesis of Ionizable Calix[4]arenes for Chelation of Selected Divalent Cations

Authors :
Markus Blumberg
Karrar Al-Ameed
Erik Eiselt
Sandra Luber
Constantin Mamat
University of Zurich
Mamat, Constantin
Source :
Molecules; Volume 27; Issue 5; Pages: 1478
Publication Year :
2022

Abstract

Two sets of functionalised calix[4]arenes, either with a 1,3-crown ether bridge or with an open-chain oligo ether moiety in 1,3-position were prepared and further equipped with additional deprotonisable sulfonamide groups to establish chelating systems for selected cations Sr2+, Ba2+, and Pb2+ ions. To improve the complexation behaviour towards these cations, calix[4]arenes with oligo ether groups and modified crowns of different sizes were synthesized. Association constants were determined by UV/Vis titration in acetonitrile using the respective perchlorate salts and logK values between 3.2 and 8.0 were obtained. These findings were supported by the calculation of the binding energies exemplarily for selected complexes with Ba2+.

Details

Language :
English
Database :
OpenAIRE
Journal :
Molecules; Volume 27; Issue 5; Pages: 1478
Accession number :
edsair.doi.dedup.....421c61986cf85e56206ad874e7452b08