Volume 46, Issue 1 e70000
RESEARCH ARTICLE

Comprehensive Analysis of Deuterium Isotope Effects on Ionic H3O+…π Interactions Using Multi-Component Quantum Mechanics Methods

Taro Udagawa

Corresponding Author

Taro Udagawa

Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan

Correspondence:

Taro Udagawa ([email protected])

Yusuke Kanematsu ([email protected])

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Yusuke Kanematsu

Corresponding Author

Yusuke Kanematsu

Smart Innovation Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan

Correspondence:

Taro Udagawa ([email protected])

Yusuke Kanematsu ([email protected])

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Takayoshi Ishimoto

Takayoshi Ishimoto

Smart Innovation Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan

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Masanori Tachikawa

Masanori Tachikawa

Graduate School of NanobioScience, Yokohama City University, Yokohama, Japan

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First published: 20 December 2024

Funding: This work was supported by Japan Society for the Promotion of Science, 21H00026, 21K04991, 22H02141, 23H23026, 23K17905.

ABSTRACT

Deuterium isotope effects on interaction energies and geometrical parameters in several H3O+(D3O+)ene and H3O+(D3O+)yne complexes, which involve O-H(D)π interactions, have been analyzed using the MP2 level of the multi-component molecular orbital method (MC_MP2), which can incorporate the nuclear quantum effects of light nuclei, such as protons and deuterons. The MC_MP2 calculations revealed that D3O+ replacement reduced the interaction energies of the complexes and induced changes in geometrical parameters. In addition, natural energy decomposition analysis (NEDA) revealed a strong correlation between the H/D isotope effects on the H/Dπ distances and on each energy component.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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