High-resolution infrared spectroscopy of naphthalene and acenaphthene dimers

Alexander K. Lemmens, Pragya Chopra, Diksha Garg, Amanda L. Steber, Melanie Schnell, Wybren Jan Buma*, Anouk M. Rijs

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Non-covalent interactions are rapidly gaining interest as they are often crucial in determining the properties of materials, and key to supramolecular chemistry and to biochemistry. Non-covalent Polycyclic Aromatic Hydrocarbon (PAH) complexes are in particular relevant to astrochemistry and combustion chemistry where they are involved in the initial steps of condensation and soot formation, respectively. Here, we investigated non-covalent π-π stacking and CH-π interactions in naphthalene and acenaphthene clusters using high-resolution IR-UV spectroscopy in combination with quantum chemical calculations. We identified spectral shifts that occur upon complexation and thereby evaluated predicted potential energy surfaces. Although theory predicts a blueshift, a redshift is observed for the aliphatic CH-π interactions in the experimental spectrum of acenaphthene upon dimerization, indicating that CH-π interaction indeed affects the aliphatic bonds, while a blueshift is predicted, consequently theory deserves attention here. The results provide strong indications for a prevalent parallel naphthalene dimer, showing that π-π stacking interactions become significant for bicyclic and larger PAHs.

Original languageEnglish
Article numbere1811908
JournalMolecular Physics
Volume119
Issue number1-2
DOIs
Publication statusPublished - 17 Jan 2021
Externally publishedYes

Keywords

  • geometry
  • infrared spectroscopy
  • non-covalent
  • PAH clusters
  • π-π interactions

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