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Updated: May 30, 2026

Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
Published on: February 28, 2025
Intramolecular hydrogen bonds: the QTAIM and ELF characteristics
Franck Fuster1, Sławomir J Grabowski
1Laboratorie de Chimie Théorique (UMR-CNRS 7616), Université Pierre et Marie Curie , 4 Place Jussieu 75252-Paris cédex, France.
Abstract:
B3LYP/aug-cc-pVTZ calculations were performed on the species with intramolecular O-H···O hydrogen bonds. The Quantum Theory of Atoms in Molecules (QTAIM) and the Electron Localization Function (ELF) method were applied to analyze these interactions. Numerous relationships between ELF and QTAIM parameters were found. It is interesting that the CVB index based on the ELF method as well as the total electron energy density at the bond critical point of the proton-acceptor distance (H(bcp)) may be treated as universal descriptors of the hydrogen bond strength, they are also useful to estimate the covalent character of this interaction. There are so-called resonance-assisted hydrogen bonds (RAHBs) among the species analyzed here. It was found that there are not any distinct differences between RAHBs and the other intramolecular hydrogen bonds.
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