Nonlinear Dependence on Na+ Ions for the Binding Dynamics of Cucurbit[6]uril with the trans-1-Methyl-4-(4-hydroxystyryl)pyridinium Cation

The binding dynamics of the trans-1-methyl-4-(4-hydroxystyryl)­pyridinium cation (HSP+) to cucurbit[6]­uril (CB[6]) in the presence of Na+ cations were studied to establish the effect of the relative concentrations of the system’s components (HSP+, CB[6], and Na+) on these dynamics. The formation of...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2020-11, Vol.124 (45), p.10219-10225
Main Authors: Tang, Hao, Thomas, Suma S, Wolf, Luise, Natarajan, Palani, Ko, Young Ho, Wilson, James, Kim, Kimoon, Bohne, Cornelia
Format: Article
Language:English
Subjects:
B: Liquids, Chemical and Dynamical Processes in Solution, Spectroscopy in Solution
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Summary:The binding dynamics of the trans-1-methyl-4-(4-hydroxystyryl)­pyridinium cation (HSP+) to cucurbit[6]­uril (CB[6]) in the presence of Na+ cations were studied to establish the effect of the relative concentrations of the system’s components (HSP+, CB[6], and Na+) on these dynamics. The formation of the HSP+@CB­[6] complex was temporally uncoupled from the photoisomerization of trans-HSP+, while a nonlinear effect of the Na+ cation concentration on the HSP+@CB­[6] dynamics was observed. This nonlinearity is a consequence of Na+ having the opposite effect on the association and dissociation rate constants for the HSP+@CB­[6] complex, creating a conceptual framework for using such nonlinearities to control multistep reactions in cucurbit­[n]­uril chemistry.
ISSN:1520-6106
1520-5207
DOI:10.1021/acs.jpcb.0c07554