Comprehensive Analysis of Deuterium Isotope Effects on Ionic H3O+…π Interactions Using Multi-Component Quantum Mechanics Methods
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Updated: Jun 4, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
Taro Udagawa1, Yusuke Kanematsu2, Takayoshi Ishimoto2
1Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Gifu, Japan.
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/D…π distances and on each energy component.
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