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Related Experiment Videos

Theoretical perspectives on proton-coupled electron transfer reactions.

S Hammes-Schiffer1

  • 1Department of Chemistry, The Pennsylvania State University, 152 Davey Laboratory, University Park, PA 16802, USA. shs@chem.psu.edu

Accounts of Chemical Research
|April 20, 2001
PubMed
Summary

This study introduces a quantum mechanical theory for proton-coupled electron transfer reactions. The framework predicts reaction rates, mechanisms, and kinetic isotope effects, incorporating solvent and protein dynamics.

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Area of Science:

  • Physical Chemistry
  • Theoretical Chemistry
  • Chemical Physics

Background:

  • Proton-coupled electron transfer (PCET) reactions are fundamental in biological and chemical processes.
  • Understanding the interplay between proton and electron transfer is crucial for predicting reaction dynamics.
  • Existing models often simplify the quantum mechanical treatment of electrons and protons.

Purpose of the Study:

  • To develop a comprehensive theoretical formulation for PCET reactions.
  • To provide a quantum mechanical treatment for both active electrons and transferring protons.
  • To enable accurate predictions of PCET reaction rates, mechanisms, and kinetic isotope effects.

Main Methods:

  • Quantum mechanical treatment of electrons and protons.

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  • Derivation of free energy surfaces as functions of collective solvent coordinates.
  • Development of rate expressions in relevant limits.
  • Inclusion of dynamical effects from solvent and protein environments.

    • Main Results:

    • A theoretical framework for PCET reactions has been established.
    • Free energy surfaces are obtained as functions of collective solvent coordinates.
    • Methodology for incorporating solvent and protein dynamical effects is presented.

    Conclusions:

    • The developed theoretical framework accurately describes PCET reactions.
    • This approach allows for the prediction of reaction rates, mechanisms, and kinetic isotope effects.
    • The model provides insights into the complex dynamics of proton and electron transfer processes.