Abstract
Using 1H NMR spectroscopy together with density functional theoretical calculations, it is shown that electroneutral p-tert-butylcalix[4]arenetetraacetic acid forms an equimolar complex with a proton in the form of the H3O+ ion in nitrobenzene-d 5. Protons were offered by hydrogen bis(1,2-dicarbollyl)cobaltate and converted to hydroxonium ions by traces of water. In the resulting complex, the H3O+ cation is bound by strong hydrogen bonds to two phenoxy oxygen atoms of the parent calix[4]arene ligand and to one carbonyl oxygen of the corresponding COOH group of this ligand.
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This work was supported by the Academy of Sciences of the Czech Republic, project T 400500402, and by the Czech Ministry of Education, Youth, and Sports, projects MSM 4977751303, MSM 6046137301, and MSM 6046137307.
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Kříž, J., Dybal, J., Makrlík, E. et al. Protonation of electroneutral p-tert-butylcalix[4]arenetetraacetic acid. Monatsh Chem 141, 19–22 (2010). https://doi.org/10.1007/s00706-009-0218-3
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DOI: https://doi.org/10.1007/s00706-009-0218-3