Tri-ionizable calix[4]arene ligands: synthesis and lanthanide ion complexation

Abstract

New proton-ionizable p-tert-butylcalix-4-arene ligands with three N-(X)sulfonyl oxyacetamide groups and one methoxy group on the lower rim capable of forming electroneutral complexes with trivalent lanthanide ions are synthesized. Variation of the electron-withdrawing ability of X (Me, Ph, C6H4-4-NO2, CF3) is used to tune the ligand acidity. Conformations of the ligands in CDCl3 are investigated by variable temperature NMR spectroscopy. By potentiometric titration, complexation of La3+, Eu3+, and Yb3+ by the tri-ionizable complexing agents in MeOH is probed.

Description

This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

Proton-ionizable Calixarene, Lathanide Ion Complexation, Potentiometric Titration

Citation

Fernandez, F. A., Bartsch, R. A., Arnaud-Neu, F., Hubscher-Bruder, V., & Michel, S. (2010). Tri-ionizable calix[4]arene ligands: synthesis and lanthanide ion complexation. ARKIVOC, 2010(7), 191-202. https://doi.org/10.3998/ark.5550190.0011.715

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