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dc.contributor.authorLingchun Song
dc.contributor.authorYuchun Lin
dc.contributor.authorWei Wu
dc.contributor.author吴炜
dc.contributor.authorQianer Zhang
dc.contributor.author张乾二
dc.contributor.authorYirong Mo
dc.date.accessioned2011-11-25T01:31:14Z
dc.date.available2011-11-25T01:31:14Z
dc.date.issued2005-02
dc.identifier.citationJ. Phys. Chem. A, 2005, 109 (10): 2310–2316zh_CN
dc.identifier.issn1089-5639
dc.identifier.urihttp://dx.doi.org/doi:10.1021/jp044700s
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/11240
dc.description.abstractRotation barriers in the group IVB ethane congeners H3X-YH3 (X, Y = C, Si, Ge, Sn, Ph) have been systematically studied and deciphered using the ab initio valence bond theory in terms of the steric strain and hyperconjugation effect. Our results show that in all cases the rotation barriers are dominated by the steric repulsion whereas the hyperconjugative interaction between the X-H bond orbitals and the vicinal Y-H antibond orbitals (and vice versa) plays a secondary role, although indeed the hyperconjugation effect favors staggered structures. By the independent estimations of the hyperconjugative and steric interactions in the process of rotations, we found that the structural effect which mainly refers to the central X-Y bond relaxation makes a small contribution to the rotational barriers. Therefore, we conclude that both the rigid and fully relaxed rotations in the group IVB ethane congeners H3X-YH3 observe the same mechanism which is governed by the conventional steric repulsion.zh_CN
dc.language.isoenzh_CN
dc.publisherAMER CHEMICAL SOCzh_CN
dc.titleSteric strain versus hyperconjugative stabilization in ethane congenerszh_CN
dc.typeArticlezh_CN


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