When does a hydrogen bond become a van der Waals interaction? a topological answer

Christian Tantardini

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The hydrogen bond (H-bond) is among the most important noncovalent interaction (NCI) for bioorganic compounds. However, no “energy border” has yet been identified to distinguish it from van der Waals (vdW) interaction. Thus, classifying NCIs and interpreting their physical and chemical importance remain open to great subjectivity. In this work, the “energy border” between vdW and H-bonding interactions was identified using a dimer of water, as well as for a series of classical and nonclassical H-bonding systems. Through means of the quantum theory of atoms in molecules and in particular the source function, it was possible to clearly identify the transition from H-bonding to vdW bonding via analysis of the electronic structure. This “energy border” was identified both on elongating the interatomic interaction and by varying the contact angle. Hence, this study also redefines the “critic angle” previously proposed by Galvão et al. (J. Phys. Chem. A 2013, 117, 12668). Consequently, such “energy border” through an analysis of atomic basins volume variation was possible to identify the end of long-range interactions.

Original languageEnglish
Pages (from-to)937-943
Number of pages7
JournalJournal of Computational Chemistry
Volume40
Issue number8
DOIs
Publication statusPublished - 30 Mar 2019

Keywords

  • H-bond
  • quantum theory atoms in molecule
  • source function
  • Van der Waals

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