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Covalency of hydrogen bonds in liquid water can be probed by proton nuclear magnetic resonance experiments

Author

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  • Hossam Elgabarty

    (Dynamics of Condensed Matter, University of Paderborn)

  • Rustam Z. Khaliullin

    (University of Zurich
    McGill University)

  • Thomas D. Kühne

    (Dynamics of Condensed Matter, University of Paderborn
    Paderborn Center for Parallel Computing and Institute for Lightweight Design with Hybrid Systems)

Abstract

The concept of covalency is widely used to describe the nature of intermolecular bonds, to explain their spectroscopic features and to rationalize their chemical behaviour. Unfortunately, the degree of covalency of an intermolecular bond cannot be directly measured in an experiment. Here we established a simple quantitative relationship between the calculated covalency of hydrogen bonds in liquid water and the anisotropy of the proton magnetic shielding tensor that can be measured experimentally. This relationship enabled us to quantify the degree of covalency of hydrogen bonds in liquid water using the experimentally measured anisotropy. We estimated that the amount of electron density transferred between molecules is on the order of 10 m while the stabilization energy due to this charge transfer is ∼15 kJ mol−1. The physical insight into the fundamental nature of hydrogen bonding provided in this work will facilitate new studies of intermolecular bonding in a variety of molecular systems.

Suggested Citation

  • Hossam Elgabarty & Rustam Z. Khaliullin & Thomas D. Kühne, 2015. "Covalency of hydrogen bonds in liquid water can be probed by proton nuclear magnetic resonance experiments," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9318
    DOI: 10.1038/ncomms9318
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