The gauche effect in XCH2CH2X revisited

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorSilva, Daniela Rodrigues-
Autor(es): dc.creatorSantos, Lucas de Azevedo-
Autor(es): dc.creatorHamlin, Trevor A.-
Autor(es): dc.creatorGuerra, Célia Fonseca-
Autor(es): dc.creatorFreitas, Matheus P.-
Autor(es): dc.creatorBickelhaupt, Matthias-
Data de aceite: dc.date.accessioned2026-02-09T12:29:39Z-
Data de disponibilização: dc.date.available2026-02-09T12:29:39Z-
Data de envio: dc.date.issued2022-01-05-
Data de envio: dc.date.issued2022-01-05-
Data de envio: dc.date.issued2021-02-07-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/48800-
Fonte completa do material: dc.identifierhttps://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cphc.202100090-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1162402-
Descrição: dc.descriptionWe have quantum chemically investigated the rotational isomerism of 1,2-dihaloethanes XCH2CH2X (X = F, Cl, Br, I) at ZORA-BP86-D3(BJ)/QZ4P. Our Kohn-Sham molecular orbital (KS-MO) analyses reveal that hyperconjugative orbital interactions favor the gauche conformation in all cases (X = F−I), not only for X = F as in the current model of this so-called gauche effect. We show that, instead, it is the interplay of hyperconjugation with Pauli repulsion between lone-pair-type orbitals on the halogen substituents that constitutes the causal mechanism for the gauche effect. Thus, only in the case of the relatively small fluorine atoms, steric Pauli repulsion is too weak to overrule the gauche preference of the hyperconjugative orbital interactions. For the larger halogens, X⋅⋅⋅X steric Pauli repulsion becomes sufficiently destabilizing to shift the energetic preference from gauche to anti, despite the opposite preference of hyperconjugation.-
Idioma: dc.languageen-
Publicador: dc.publisherWiley-
Direitos: dc.rightsrestrictAccess-
???dc.source???: dc.sourceChemPhysChem-
Palavras-chave: dc.subjectActivation strain model-
Palavras-chave: dc.subjectBond theory-
Palavras-chave: dc.subjectConformational analysis-
Palavras-chave: dc.subjectEnergy decomposition analysis-
Palavras-chave: dc.subjectGauche effect-
Título: dc.titleThe gauche effect in XCH2CH2X revisited-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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