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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

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Anion-π interaction at the solid/water interfaces.

Masaaki Akamatsu¹, Ayumi Kimura², Koji Yamanaga²

¹Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan and Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

Chemical Communications (Cambridge, England)

|April 16, 2021

Summary

Anion-π interactions are crucial at interfaces. This study quantifies single-molecule forces for anion-π interactions at solid/water interfaces, revealing key adsorption factors.

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Area of Science:

Surface Science
Physical Chemistry
Supramolecular Chemistry

Background:

Anion-π interactions are vital in interfacial phenomena.
Understanding these interactions is key for controlling surface properties.

Purpose of the Study:

To evaluate anion-π interactions at the solid/water interface.
To quantify the single-molecule forces involved in these interactions.

Main Methods:

Quartz Crystal Microbalance (QCM) measurements to study anion adsorption.
Force curve measurements to determine single-molecule forces.

Main Results:

Anion adsorption correlated with hydration energy and conjugated systems.
Single-molecule force of anion-π interaction measured at approximately 40 pN.
First reported single-molecule force measurement for anion-π interactions.

Conclusions:

Anion-π interactions significantly influence adsorption at solid/water interfaces.
This study provides the first direct measurement of single-molecule anion-π interaction forces.