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- W2022899054 abstract "Abstract Ab initio configuration interaction through‐space/bond interaction analysis was proposed for the examination of specific intramolecular interactions including the effect of electron correlations. To test the effectiveness of our method, we applied it to rotational barrier in ethane. The results of our test suggest that the insensitivity of the ethane barrier to geometric relaxations is intimately connected with the cancellation of interactions through orbital overlaps and other factors. The orbital overlaps include exchange repulsion and hyperconjugation; other factors include classic Coulomb interaction and changes in bond orbital energy. The rotational state without the barrier (pure through‐bond state) can be achieved by deleting not only the “vicinal” interactions between the CH bonds that belong to different methyl groups but also the “geminal” interactions within the methyl groups. Our mixing analysis of molecular orbitals supports the superiority of the staggered conformer by hyperconjugation. Moreover, it was demonstrated that our treatment could be applied to excited states as well as to the ground state, including electron correlation effects. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003" @default.
- W2022899054 created "2016-06-24" @default.
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- W2022899054 date "2003-01-01" @default.
- W2022899054 modified "2023-10-18" @default.
- W2022899054 title "Pure through-bond state in organic molecules for analysis of the relationship between intramolecular interactions and total energy" @default.
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- W2022899054 doi "https://doi.org/10.1002/qua.10523" @default.
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