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. 2022 Dec 12;61(50):e202213467.
doi: 10.1002/anie.202213467. Epub 2022 Nov 15.

Ultra-Tight Host-Guest Binding with Exceptionally Strong Positive Cooperativity

Thomas A Sobiech  1 , Yulong Zhong  1 , Daniel P Miller  2 , Jillian K McGrath  1 , Christina T Scalzo  1 , Morgan C Redington  1 , Eva Zurek  1 , Bing Gong  1
Affiliations

Ultra-Tight Host-Guest Binding with Exceptionally Strong Positive Cooperativity

Thomas A Sobiech et al. Angew Chem Int Ed Engl. .

Erratum in

Abstract

Cooperativity plays a critical role in self-assembly and molecular recognition. A rigid aromatic oligoamide macrocycle with a cyclodirectional backbone binds with DABCO-based cationic guests in a 2 : 1 ratio in high affinities (Ktotal ≈1013 M-2 ) in the highly polar DMF. The host-guest binding also exhibits exceptionally strong positive cooperativity quantified by interaction factors α that are among the largest for synthetic host-guest systems. The unusually strong positive cooperativity, revealed by isothermal titration calorimetry (ITC) and fully corroborated by mass spectrometry, NMR and computational studies, is driven by guest-induced stacking of the macrocycles and stabilization from the alkyl end chains of the guests, interactions that appear upon binding the second macrocycle. With its tight binding driven by extraordinary positive cooperativity, this host-guest system provides a tunable platform for studying molecular interactions and for constructing stable supramolecular assemblies.

Keywords: Cooperativity; Host-Guest Complexes; Macrocycles; Molecular Recognition; Self-Assembly.

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References

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