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Delving into the Variability of Supramolecular Affinity
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Orientador(es)
Resumo(s)
The determination of binding constants is a key matter in evaluating the strength of host–guest interactions. However, the profound impact of self-ion pairing on this parameter is often underrated in aqueous solution, leading in some cases to a misinterpretation of the true potential of supramolecular assemblies. In the present study, we aim to shed further light on this critical factor by exploring the concentration-dependent behavior of a multicharged pillararene in water. Our observations reveal an extraordinary 1-million-fold variability in the affinity of this macrocycle toward a given anion, showcasing the highly dynamic character of electrostatic interactions. We argue that these findings bring to the forefront the inherent determinism that underlies the estimation of affinity constants, a factor profoundly shaped by both the sensitivity of the instrumental technique in use and the intricacies of the experimental design itself. In terms of applications, these results may provide the opportunity to optimize the operational concentrations of multicharged hosts in different scenarios, aiming to achieve their maximum efficiency based on the intended application. Unlocking the potential of this hidden variability may pave the way for the creation of novel molecular materials with advanced functionalities.
Descrição
Funding Information: This work was funded by Ministerio de Ciencia e Innovación (PID2020‐113704RB‐I00), and Xunta de Galicia (Centro Singular de Investigación de Galicia‐Accreditation 2019‐2022 ED431G 2019/06, ED431C 2022/24, and ED431C 2021/45). Publisher Copyright: © 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.
Palavras-chave
Host-Guest Ion-Pairing Macrocycle Pillararene Supramolecular Affinity Catalysis General Chemistry