Intermolecular interaction in nucleobases and dimethyl sulfoxide/water molecules: A DFT, NBO, AIM and NCI analysis

Natarajan Sathiyamoorthy Venkataramanan, Ambigapathy Suvitha, Yoshiyuki Kawazoe

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

This study aims to cast light on the physico-chemical nature and energetics of interactions between the nucleobases and water/DMSO molecules which occurs through the non-conventional CH⋯O/N − H bonds using a comprehensive quantum-chemical approach. The computed interaction energies do not show any appreciable change for all the nucleobase-solvent complexes, conforming the experimental findings on the hydration enthalpies. Compared to water, DMSO form complexes with high interaction energies. The quantitative molecular electrostatic potentials display a charge transfer during the complexation. NBO analysis shows the nucleobase-DMSO complexes, have higher stabilization energy values than the nucleobase-water complexes. AIM analysis illustrates that the in the nucleobase-DMSO complexes, S[dbnd]O⋯H-N type interaction have strongest hydrogen bond strength with high EHB values. Furthermore, the Laplacian of electron density and total electron density were negative indicating the partial covalent nature of bonding in these systems, while the other bonds are classified as noncovalent interactions. EDA analysis indicates, the electrostatic interaction is more pronounced in the case of nucleobase-water complexes, while the dispersion contribution is more dominant in nucleobase-DMSO complexes. NCI-RDG analysis proves the existence of strong hydrogen bonding in nucleobase-DMSO complex, which supports the AIM results.

Original languageEnglish
Pages (from-to)48-60
Number of pages13
JournalJournal of Molecular Graphics and Modelling
Volume78
DOIs
Publication statusPublished - 2017 Nov

Keywords

  • AIM
  • DFT
  • Non-covalent interactions
  • Nucleobases
  • Solvents

ASJC Scopus subject areas

  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Computer Graphics and Computer-Aided Design
  • Materials Chemistry

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