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Hydronium Ion Transport across the Liquid/Liquid Interface Assisted by a Phase-Transfer Catalyst: Structure and

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Phase-transfer catalysts (PTCs) like tetrakis(pentafluorophenyl) borate anion (TPFB⁻) significantly lower the energy barrier for transferring hydronium ions (H₃O⁺) between water and organic solvents. This ion pair formation enhances PTC efficiency.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Interface Science

Background:

  • Understanding ion transfer across interfaces is crucial for chemical processes.
  • Phase-transfer catalysis (PTC) enables reactions between immiscible phases.
  • Hydronium ion (H₃O⁺) transfer is fundamental in aqueous and organic chemistry.

Purpose of the Study:

  • To investigate the thermodynamic and structural factors governing H₃O⁺ transfer across a water/1,2-dichloroethane (DCE) interface.
  • To evaluate the role of tetrakis(pentafluorophenyl) borate anion (TPFB⁻) as a phase-transfer catalyst for H₃O⁺.
  • To characterize the solvation structure and stability of the H₃O⁺-TPFB⁻ ion pair at the interface and in the organic phase.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model the system.
  • Free energy calculations were performed to quantify the transfer energetics.
  • Structural analysis of hydration shells and ion pair interactions was conducted.

Main Results:

  • The free energy of transferring the H₃O⁺-TPFB⁻ ion pair from water to DCE is 6 ± 1 kcal/mol, substantially lower than that of the free H₃O⁺ ion (17 ± 1 kcal/mol).
  • The H₃O⁺-TPFB⁻ ion pair exhibits stability at the interface and in DCE, facilitated by three associated water molecules.
  • A small dissociation barrier for the ion pair supports its function as an effective PTC.
  • The transfer process for both the ion pair and the free H₃O⁺ ion involves a characteristic finger-like water structure.

Conclusions:

  • TPFB⁻ significantly enhances the transfer of H₃O⁺ across the water/DCE interface by forming a stable ion pair.
  • The solvation structure, particularly the role of water molecules, is critical for the efficient phase transfer of ions.
  • These findings provide molecular-level insights into the mechanism of phase-transfer catalysis involving hydronium ions.