2008
DOI: 10.1021/ar800001k
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Predicting Hydrogen-Bond Strengths from Acid−Base Molecular Properties. The pKa Slide Rule: Toward the Solution of a Long-Lasting Problem

Abstract: Unlike normal chemical bonds, hydrogen bonds (H-bonds) characteristically feature binding energies and contact distances that do not simply depend on the donor (D) and acceptor (:A) nature. Instead, their chemical context can lead to large variations even for a same donor-acceptor couple. As a striking example, the weak HO-H...OH(2) bond in neutral water changes, in acidic or basic medium, to the 6-fold stronger and 15% shorter [H(2)O...H...OH(2)](+) or [HO...H...OH](-) bonds. This surprising behavior, sometim… Show more

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Cited by 688 publications
(625 citation statements)
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“…The crystal structure of 4 [26] (Fig. 9) supports the calculations and spectral results, showing the existence of the enol tautomer, stabilized through strong C]O.HeO bonding (according to Gilli et al [27] in the light of the bond distances of 0.820 Å for the OeH bond and 1.816 Å for H.O]C bond). This hydrogen bonding is much stronger that the N.HeO interaction in 1 [18], which leads the better stabilization of the enol tautomer (9.8 vs 4.2 kcal/mol).…”
Section: Resultssupporting
confidence: 65%
“…The crystal structure of 4 [26] (Fig. 9) supports the calculations and spectral results, showing the existence of the enol tautomer, stabilized through strong C]O.HeO bonding (according to Gilli et al [27] in the light of the bond distances of 0.820 Å for the OeH bond and 1.816 Å for H.O]C bond). This hydrogen bonding is much stronger that the N.HeO interaction in 1 [18], which leads the better stabilization of the enol tautomer (9.8 vs 4.2 kcal/mol).…”
Section: Resultssupporting
confidence: 65%
“…As a secondary effect, the acceptance of this ARTICLE strong H-bond by the vertically-oriented H 2 O molecules leads to a significant contraction of the hydrogen bond lengths between these molecules and the surface O ions, to 1.72-1.81 Å. Even for the FeO film, which should be considered a rather acidic oxide (on the basis of the relative strengths of donor and acceptor H-bonds with water 44 ), O ions adjacent to OH groups act as H-bond acceptors as a result of cooperative hydrogen bonding. These interactions effectively separate the hexamer into three associated dimers, each held together by an especially strong hydrogen bond (1.53-1.55 Å), qualitatively similar to what has been observed for water on TiO 2 (110) 17 and predicted for MgO(100) 45 and O/Ru(0001) 46 .…”
Section: Resultsmentioning
confidence: 99%
“…A careful structural analysis of both donor and acceptors lead us to include route B, in which the active donor species was oxocarbenium ion II. The incipient acceptor could form hydrogen bonding 39,40 with the nitrile 41 functional group III). Preceding any direct glycosylation, the acceptor would be driven to target the anomeric carbocation from an axial trajectory to generate the 1,2-cis product.…”
Section: Discussionmentioning
confidence: 99%