1989
DOI: 10.1002/anie.198909921
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Abstract: Textbooks of inorganic chemistry describe the formation of adducts by coordination of an electron donor to an electron acceptor, often using the amine-boranes, X,N + BY,, as examples. In the Lewis (electron dot) formulas of the compounds, the dative bond in H,N -+ BH, and the covalent bond in H,C-CH, are both represented by a shared electron pair. In the simple molecular orbital or valence bond models the wave functions of both electron pairs would be constructed in the same manner from the appropriate sp3 typ… Show more

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Cited by 548 publications
(434 citation statements)
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“…It's a matter of practical convenience whether the energy or the mixing coefficient is used. A criterion suggested by Haaland [30] can also be applied, which interrogates where the bonding electrons go when the bond is split thermally: If the split is heterolytic, the ionic approximation follows the direction of electrons; if the split is homolytic, the typical energy of the atom's valence orbital applies. Haaland's criterion can also be evaluated by quantum-chemical calculations [31], which are, however, more involved than those of orbital energy and mixing coefficient.…”
Section: Determinationmentioning
confidence: 99%
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“…It's a matter of practical convenience whether the energy or the mixing coefficient is used. A criterion suggested by Haaland [30] can also be applied, which interrogates where the bonding electrons go when the bond is split thermally: If the split is heterolytic, the ionic approximation follows the direction of electrons; if the split is homolytic, the typical energy of the atom's valence orbital applies. Haaland's criterion can also be evaluated by quantum-chemical calculations [31], which are, however, more involved than those of orbital energy and mixing coefficient.…”
Section: Determinationmentioning
confidence: 99%
“…2 comes with a caveat: A rare exception occurs when the atom with higher Allen EN is a net acceptor of bonding electrons. This is signaled by its low orbital-mixing coefficient in the bonding MO or via loss of electrons under a heterolytic minimum-energy bond rupture in the gas phase as defined by Haaland [30]. Both imply that the energy of the relevant orbital of this acceptor atom is actually above the donor orbital as well as above the average energy of its other valence orbitals defining its higher Allen EN.…”
Section: Estimate Using Electronegativitiesmentioning
confidence: 99%
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“…Porém, não era tão fácil assim, pois havia necessidade de se estimar a ordem de ligação Zn-O e nem sabíamos que rumo tomar. Tudo culminou para isso assim: em 1989, no Angewandt Chemie, Haaland, da Noruega, publica um belíssimo artigo sobre as ligações dativas 46 . Muitos autores já haviam anteriormente discutido da necessidade ou não de se postular o modelo de ligação dativa e a balança parecia pender contra ela.…”
Section: Assuntos Geraisunclassified