4.6 Article

On the Relationship between Hydrogen Bond Strength and the Formation Energy in Resonance-Assisted Hydrogen Bonds

期刊

MOLECULES
卷 26, 期 14, 页码 -

出版社

MDPI
DOI: 10.3390/molecules26144196

关键词

hydrogen bond; interacting quantum atoms; resonance-assisted hydrogen bond

资金

  1. CONACyT/Mexico [253776]
  2. PAPIIT/UNAM [IN205118]
  3. Spanish MICINN [PGC2018-095953-B-I00]
  4. DGTIC/UNAM [LANCAD-UNAM-DGTIC-250]
  5. Spanish MICIU [FPU19/02903]

向作者/读者索取更多资源

This article evaluates the strength of RAHB by investigating the impact of substituents and the relationship between formation energy and hydrogen bond interaction energy. The study shows that substituents' effects on RAHB depend on their position within the molecular structure, casting doubts on the use of different parameters as indicators.
Resonance-assisted hydrogen bonds (RAHB) are intramolecular contacts that are characterised by being particularly energetic. This fact is often attributed to the delocalisation of pi electrons in the system. In the present article, we assess this thesis via the examination of the effect of electron-withdrawing and electron-donating groups, namely -F, -Cl, -Br, -CF3, -N(CH3)(2), -OCH3, -NHCOCH3 on the strength of the RAHB in malondialdehyde by using the Quantum Theory of Atoms in Molecules (QTAIM) and the Interacting Quantum Atoms (IQA) analyses. We show that the influence of the investigated substituents on the strength of the investigated RAHBs depends largely on its position within the pi skeleton. We also examine the relationship between the formation energy of the RAHB and the hydrogen bond interaction energy as defined by the IQA method of wave function analysis. We demonstrate that these substituents can have different effects on the formation and interaction energies, casting doubts regarding the use of different parameters as indicators of the RAHB formation energies. Finally, we also demonstrate how the energy density can offer an estimation of the IQA interaction energy, and therefore of the HB strength, at a reduced computational cost for these important interactions. We expected that the results reported herein will provide a valuable understanding in the assessment of the energetics of RAHB and other intramolecular interactions.

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