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Related Experiment Video

Updated: Jul 3, 2026

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry

Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

Guest molecule diffusion in the chitosan-ZnCl₂ complex crystal: A molecular dynamics simulation study.

Toshifumi Yui¹, Takuya Uto¹

¹Faculty of Engineering, University of Miyazaki, Nishi 1-1 Gakuen-Kibanadai, Miyazaki, 889-2192, Japan.

International Journal of Biological Macromolecules

|July 1, 2026

Summary

This summary is machine-generated.

Molecular dynamics simulations reveal that zinc chloride (ZnCl₂) molecules prefer interacting with hydroxyl groups over amino groups within chitosan crystals. This preference influences the free energy changes during ZnCl₂ diffusion in the crystal pathway.

Keywords:

Chitosan–ZnCl₂ complex crystal Potential of mean force ZnCl(2) diffusion

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Published on: January 25, 2020

Area of Science:

Materials Science
Computational Chemistry
Biopolymer Science

Background:

Chitosan-ZnCl₂ complexes are formed via solid-state conversion.
Understanding the diffusion and interaction of ZnCl₂ within chitosan is crucial for material applications.

Purpose of the Study:

To evaluate the free energy changes associated with ZnCl₂ diffusion in chitosan-ZnCl₂ complex crystal models.
To investigate the preferred interaction sites of ZnCl₂ within the chitosan matrix.

Main Methods:

Combined molecular dynamics (MD) simulations, including adaptive steered MD and umbrella sampling MD.
Potential of Mean Force (PMF) analysis to determine free energy changes.

Main Results:

PMF plots indicate a moderate endothermic free energy increase (approx. 10 kcal/mol) during ZnCl₂ diffusion.
ZnCl₂ molecules showed a preference for interacting with O6 hydroxyl groups compared to N2 amino groups.
These interactions were less frequent in expanded crystal models, suggesting confinement effects.

Conclusions:

ZnCl₂ molecules preferentially interact with chitosan's O6 hydroxyl groups in confined crystal environments.
The flexibility of the O6 hydroxyl group's orientation facilitates these interactions.
Findings are consistent with the solid-state conversion method used to form the chitosan-ZnCl₂ complex.