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Related Experiment Videos

Substituent effects in C6F6-C6H5X stacking interactions.

Benjamin W Gung1, Jay C Amicangelo

  • 1Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, USA. gungbw@muohio.edu

The Journal of Organic Chemistry
|December 2, 2006
PubMed
Summary
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Substituents on benzene dimers significantly impact pi-pi interactions. Hexafluorobenzene dimers show higher binding energies when substituents are on the pi-face, favoring parallel-displaced over sandwich configurations.

Area of Science:

  • Computational chemistry
  • Molecular interactions
  • Supramolecular chemistry

Background:

  • Understanding pi-pi interactions is crucial for molecular assembly.
  • Substituent effects on aromatic stacking are not fully understood.
  • Hexafluorobenzene (C6F6) and benzene (C6H6) are model systems for studying these interactions.

Purpose of the Study:

  • To investigate the influence of substituents on hexafluorobenzene-substituted benzene dimers.
  • To determine preferred stacking configurations and their binding energies.
  • To explore the role of charge-transfer in these interactions.

Main Methods:

  • Ab initio molecular orbital methods.
  • MP2(full)/aug-cc-pVDZ level of theory.
  • Analysis of potential energy surfaces and binding energies.

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Main Results:

  • Two minimum energy configurations were identified: substituent away from and on the pi-face.
  • Dimers with substituents on the pi-face exhibited higher binding energies.
  • Parallel-displaced configurations were favored over sandwich configurations, even for the parent C6F6-C6H6 complex.
  • Electron density isosurface shape can predict stacking behavior.

Conclusions:

  • Substituent position critically affects pi-pi interaction strength in C6F6-benzene dimers.
  • Parallel-displaced stacking is energetically preferred due to closer contacts.
  • Charge-transfer interactions are significant for specific substituents like N,N-dimethylaniline.