Size compatibility and concentration dependent supramolecular host–guest interactions at interfaces

Jintae Park, Jinwoo Park, Jinhoon Lee, Chanoong Lim () and Dong Woog Lee ()
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Jintae Park: Ulsan National Institute of Science and Technology (UNIST)
Jinwoo Park: Ulsan National Institute of Science and Technology (UNIST)
Jinhoon Lee: Ulsan National Institute of Science and Technology (UNIST)
Chanoong Lim: Ulsan National Institute of Science and Technology (UNIST)
Dong Woog Lee: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The quantification of supramolecular host–guest interactions is important for finely modulating supramolecular systems. Previously, most host–guest interactions quantified using force spectroscopic techniques have been reported in force units. However, accurately evaluating the adhesion energies of host–guest pairs remains challenging. Herein, using a surface forces apparatus, we directly quantify the interaction energies between cyclodextrin (CD)-modified surfaces and ditopic adamantane (DAd) molecules in water as a function of the DAd concentration and the CD cavity size. The adhesion energy of the β-CD–DAd complex drastically increased with increasing DAd concentration and reached saturation. Moreover, the molecular adhesion energy of a single host–guest inclusion complex was evaluated to be ~9.51 kBT. This approach has potential for quantifying fundamental information toward furthering the understanding of supramolecular chemistry and its applications, such as molecular actuators, underwater adhesives, and biosensors, which require precise tuning of specific host–guest interactions.

Date: 2022
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DOI: 10.1038/s41467-021-27659-w

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