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Electrostatically Driven CO-π Aromatic Interactions.

Ping Li1, Erik C Vik1, Josef M Maier1

  • 1Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States.

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|July 27, 2019
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Summary
This summary is machine-generated.

Researchers studied carbonyl-aromatic (CO-π) interactions using molecular balances. They found these interactions depend on aromatic ring electronics, with stronger attraction to electron-deficient rings due to CO-π bond polarization.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Physical Chemistry

Background:

  • Non-covalent interactions are crucial in molecular recognition and self-assembly.
  • Carbonyl-aromatic (CO-π) interactions are a type of non-covalent interaction involving the carbonyl group and aromatic systems.
  • Understanding CO-π interactions is essential for designing molecules with specific binding properties.

Purpose of the Study:

  • To develop molecular tools for quantifying carbonyl-aromatic (CO-π) interactions.
  • To investigate the influence of aromatic ring substituents on CO-π interaction strength.
  • To establish a predictive model for CO-π interaction energies based on electrostatic properties.

Main Methods:

  • Synthesis of N-arylimide molecular balance systems.
  • Spectroscopic analysis to measure binding affinities.
  • Computational chemistry to analyze electrostatic potentials and interaction energies.

Main Results:

  • N-arylimide molecular balances successfully quantified CO-π interactions.
  • Repulsive CO-π interactions observed with unsubstituted arenes.
  • Attractive CO-π interactions observed with electron-deficient arenes.
  • Interaction energies correlated well with electrostatic parameters of carbonyl and arene surfaces.
  • CO-π interactions were found to be stronger than previously studied oxygen-π and halogen-π interactions.

Conclusions:

  • The strength and nature of CO-π interactions are dictated by the electronic properties of the aromatic ring.
  • Electrostatic potential is a key factor in predicting CO-π interaction strength.
  • The polarized C═O bond in N-arylimides leads to significant CO-π interactions, exceeding those of O-π and halogen-π interactions.