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Issue 23, 2017
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Origin of cooperativity in hydrogen bonding

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Abstract

The origin of non-additivity in hydrogen bonds (H-bonds), usually termed as H-bond cooperativity, is investigated in H-bonded linear chains. It is shown that H-bond cooperativity originates solely from classical electrostatics. The latter is corroborated by comparing the H-bond cooperativity in infinitely-long H-bonded hydrogen cyanide, 4-pyridone and formamide chains, assessed using density functional theory (DFT), against the strengthening of the dipole–dipole interaction upon the formation of an infinite chain of effective point-dipoles. It is found that the magnitude of these effective point-dipoles is a consequence of mutual polarization and additional effects beyond a polarizable point-dipole model. Nevertheless, the effective point-dipoles are fully determined once a single H-bond is formed, indicating that quantum effects involved in H-bonding are circumscribed to nearest-neighbor interactions only; i.e. in a linear chain of H-bonds, quantum effects do not contribute to the H-bond non-additivity. This finding is verified by estimating cooperativity along the dissociation path of H-bonds in the infinite chains, using two empirical parameters that account for polarizability, together with DFT association energies and molecular dipoles of solely monomers and dimers.

Graphical abstract: Origin of cooperativity in hydrogen bonding

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Publication details

The article was received on 16 Mar 2017, accepted on 15 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7CP01695F
Citation: Phys. Chem. Chem. Phys., 2017,19, 15256-15263
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    Origin of cooperativity in hydrogen bonding

    J. Nochebuena, C. Cuautli and J. Ireta, Phys. Chem. Chem. Phys., 2017, 19, 15256
    DOI: 10.1039/C7CP01695F

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