Tuning CH Hydrogen Bond-Based Receptors toward Picomolar Anion Affinity via the Inductive Effect of Distant Substituents

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Authors

CHVOJKA Matúš MADEA Dominik VALKENIER Hennie ŠINDELÁŘ Vladimír

Year of publication 2024
Type Article in Periodical
Magazine / Source Angewandte Chemie
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1002/ange.202318261
Doi http://dx.doi.org/10.1002/ange.202318261
Keywords Anion Binding; Host–Guest Chemistry; Macrocycles; Bambusurils; NMR spectroscopy
Attached files
Description Inspired by nature, artificial hydrogen bond-based anion receptors have been developed to achieve high anion selectivity; however, their binding affinity is usually low. The potency of these receptors is usually increased by the introduction of aryl substituents, which withdraw electrons from their binding site through the resonance effect. Here, we show that the polarization of the C(sp3)-H binding site of bambusuril receptors, and thus their potency to bind anions, can be modulated by the inductive effect. The presence of electron-withdrawing groups on benzyl substituents of bambusurils significantly increases their binding affinities to halides, resulting in the strongest iodide receptor reported to date with an association constant greater than 1013 M-1 in acetonitrile. A Hammett plot showed that while the bambusuril affinity toward halides linearly increases with the electron-withdrawing power of their substituents, their binding selectivity remains essentially unchanged.
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