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The Hunter-Sanders model for aromatic interactions is revisited. While some aspects are flawed, it correctly predicts geometries for T-shaped dimers and substituent effects in benzene sandwich dimers.

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Area of Science:

  • Computational chemistry
  • Physical chemistry
  • Chemical physics

Background:

  • The Hunter-Sanders model is a foundational theory for understanding aromatic system interactions.
  • Recent work challenged its predictions, attributing parallel displaced geometries to steric repulsion rather than Coulombic forces.
  • This study re-evaluates the Hunter-Sanders potential's accuracy against recent findings.

Purpose of the Study:

  • To critically assess the validity of the Hunter-Sanders potential in predicting aromatic dimer geometries.
  • To re-examine the claims made by Carter-Fenk and Herbert regarding the Hunter-Sanders potential's predictive failures.
  • To clarify the strengths and weaknesses of the Hunter-Sanders potential for various aromatic systems.

Main Methods:

  • Re-implementation and analysis of the Hunter-Sanders potential.
  • Comparison of predicted geometries with experimental and computational data for parallel and T-shaped aromatic dimers.
  • Evaluation of the potential's performance with substituted benzene dimers and heterocyclic systems.

Main Results:

  • The Hunter-Sanders potential, when correctly implemented, provides qualitatively accurate predictions for T-shaped benzene dimers.
  • It accurately captures the enhancing effect of substituents on benzene sandwich dimer stacking.
  • The potential, however, inaccurately predicts displacement directions for some parallel displaced geometries with substituents over the ring.

Conclusions:

  • The Hunter-Sanders potential retains qualitative accuracy for certain aromatic interactions, particularly T-shaped dimers.
  • Recent criticisms regarding its predictive failures are based on flawed data or implementation.
  • While not universally perfect, the Hunter-Sanders potential remains a valuable tool for understanding specific aromatic interactions.