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Issue 23, 2017
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Sigma-hole carbon-bonding interactions in carbon–carbon double bonds: an unnoticed contact

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Abstract

In this manuscript, we combine high-level ab initio calculations on some small complexes and a CSD survey to analyze the existence of unprecedented noncovalent carbon bonds in X2C[double bond, length as m-dash]CH2⋯Y systems (Y = electron-rich atom or group). The methylene group is usually seen as a weak hydrogen bond donor when interacting with an electron-rich atom. However, we demonstrate that when the electron-rich atom is located equidistant from the two H atoms and along the C[double bond, length as m-dash]C bond a σ-hole noncovalent carbon-bonding interaction is established, instead of a bifurcated hydrogen bond, as derived from Atoms-in-Molecules (AIM) and Natural bond orbital (NBO) analyses. The physical nature of the interaction has been analyzed using the Symmetry Adapted Perturbation Theory (SAPT) method. The results indicate that electrostatics is very important followed by either the induction or dispersion terms in anionic and neutral complexes, respectively. In addition the CSD analysis reveals the existence of such interactions, giving reliability to our calculations, which are much more numerous for neutral than for anionic Y systems.

Graphical abstract: Sigma-hole carbon-bonding interactions in carbon–carbon double bonds: an unnoticed contact

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Publication details

The article was received on 20 Mar 2017, accepted on 18 May 2017 and first published on 19 May 2017


Article type: Paper
DOI: 10.1039/C7CP01780D
Citation: Phys. Chem. Chem. Phys., 2017,19, 15530-15540
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    Sigma-hole carbon-bonding interactions in carbon–carbon double bonds: an unnoticed contact

    D. Quiñonero, Phys. Chem. Chem. Phys., 2017, 19, 15530
    DOI: 10.1039/C7CP01780D

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