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dc.creatorSilva, Daniela Rodrigues-
dc.creatorSantos, Lucas de Azevedo-
dc.creatorHamlin, Trevor A.-
dc.creatorGuerra, Célia Fonseca-
dc.creatorFreitas, Matheus P.-
dc.creatorBickelhaupt, Matthias-
dc.identifier.citationSILVA, D. R. et al. The gauche effect in XCH2CH2X revisited. ChemPhysChem, [S.l.], v. 22, n. 7, p. 641-648, Feb. 2021. DOI: 10.1002/cphc.202100090.pt_BR
dc.description.abstractWe 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.pt_BR
dc.subjectActivation strain modelpt_BR
dc.subjectBond theorypt_BR
dc.subjectConformational analysispt_BR
dc.subjectEnergy decomposition analysispt_BR
dc.subjectGauche effectpt_BR
dc.titleThe gauche effect in XCH2CH2X revisitedpt_BR
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