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The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Revealing the way of self-complementary dimerization for a shape-persistent macrocycle using density functional

Man-Fai Ng1, Shuo-Wang Yang

  • 1Institute of High Performance Computing, The Capricorn, Singapore 117528, Singapore.

The Journal of Physical Chemistry. B
|November 30, 2007
PubMed
Summary

This study reveals the preferred face-to-face geometry of a shape-persistent dimeric macrocycle using computational methods. Findings clarify dimer formation and aid in predicting similar pi-pi interacting systems.

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Area of Science:

  • Supramolecular Chemistry
  • Computational Chemistry
  • Organic Chemistry

Background:

  • Shape-persistent macrocycles are crucial in supramolecular chemistry.
  • Dimeric macrocycles with pi-pi interactions present geometric ambiguities.
  • Understanding these interactions is key for designing novel molecular architectures.

Purpose of the Study:

  • To determine the preferred three-dimensional geometry of a specific dimeric macrocycle.
  • To elucidate the factors governing the face-to-face arrangement of alternating hexylbenzene and perfluorobenzene rings.
  • To resolve experimental ambiguities regarding dimer formation.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to map the spatial energy profile.
  • Analysis of intermolecular interaction energy and 1H NMR chemical shifts.
  • Comparison of computational predictions with existing experimental data.

Main Results:

  • A preferred face-to-face geometry for the dimeric macrocycle was identified.
  • The optimal configuration features a rotational offset of approximately 51.5 degrees and an intermolecular distance of 3.91 Å.
  • Calculated data, including intermolecular interaction energy and NMR shifts, showed excellent agreement with experimental results.

Conclusions:

  • The study successfully resolved ambiguities in experimental observations of dimer formation.
  • The findings provide valuable insights into the pi-pi stacking interactions within dimeric macrocycles.
  • This work offers a predictive framework for the geometry of similar supramolecular systems.