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Large Proton-Affinity Enhancements Triggered by Noncovalent Interactions.

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Noncovalent interactions (NCI) with Lewis bases (LB) enhance the proton affinity (PA) of hydroxyl (OH) groups in YHxOH compounds. The type of NCI, not just its strength, dictates the extent of this PA enhancement.

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Area of Science:

  • * Computational chemistry
  • * Molecular interactions
  • * Quantum chemistry

Background:

  • * The proton affinity (PA) of hydroxyl (OH) groups is a fundamental chemical property.
  • * Noncovalent interactions (NCI) significantly influence molecular properties.
  • * Understanding these interactions is crucial for predicting chemical reactivity.

Purpose of the Study:

  • * To investigate how noncovalent interactions (NCI) with Lewis bases (LB) affect the proton affinity (PA) of YHxOH compounds.
  • * To determine the relationship between NCI type and the magnitude of PA enhancement.
  • * To elucidate the role of binding energies in sigma-hole interactions.

Main Methods:

  • * Theoretical calculations of proton affinity.
  • * Analysis of noncovalent interactions (NCI) using computational chemistry.
  • * Examination of binding energies in protonated species.

Main Results:

  • * Noncovalent interaction (NCI) with Lewis bases (LB) consistently increases the proton affinity (PA) of YHxOH compounds.
  • * The degree of PA enhancement is dependent on the specific type of NCI.
  • * Weak NCIs can result in PA enhancements comparable to or greater than strong NCIs.
  • * Binding energies of protonated species are critical factors, particularly in sigma-hole interactions.

Conclusions:

  • * Noncovalent interactions (NCI) are effective modulators of hydroxyl group proton affinity (PA).
  • * The nature of the interaction is a key determinant of PA enhancement, not solely interaction strength.
  • * Sigma-hole interactions highlight the importance of binding energies in proton affinity modulation.