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Updated: Jun 3, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Constrained Nuclear-Electronic Orbital Transition State Theory Using Energy Surfaces with Nuclear Quantum Effects.

Zehua Chen1, Jingjing Zheng2, Donald G Truhlar3

  • 1Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.

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A new method, constrained nuclear-electronic orbital transition state theory (CNEO-TST), accurately predicts reaction rates for hydrogen-atom transfer. This approach accounts for quantum effects like tunneling, offering a cost-effective tool for chemical and biological reaction dynamics.

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Area of Science:

  • Chemical kinetics
  • Quantum chemistry
  • Theoretical chemistry

Background:

  • Hydrogen-atom transfer is vital in chemistry and biology.
  • Accurately modeling quantum effects like tunneling in these reactions is difficult.
  • Existing methods struggle with precise kinetic isotope effect predictions.

Purpose of the Study:

  • To develop a novel theoretical framework for predicting hydrogen-atom transfer reaction rates.
  • To incorporate quantum mechanical effects, including zero-point energy and tunneling, into rate predictions.
  • To validate the new method against experimental data for gas-phase reactions.

Main Methods:

  • Combining transition state theory (TST) with constrained nuclear-electronic orbital (CNEO) theory to create CNEO-TST.
  • Utilizing CNEO density functional theory (CNEO-DFT) for generating effective potential energy surfaces.
  • Calculating reaction rate constants for gas-phase hydrogen-atom transfer and deuterated reactions.

Main Results:

  • CNEO-TST accurately predicts reaction rates at room temperature.
  • The method effectively includes zero-point energy and shallow tunneling effects.
  • Computational scaling of CNEO-DFT makes the approach economical for large systems.
  • Achieves accuracy comparable to advanced variational TST methods.

Conclusions:

  • CNEO-TST is a valuable tool for predicting reaction rates, especially for reactions with significant quantum motion.
  • The method is applicable to diverse chemical and biochemical processes involving hydrogen, proton, or hydride transfer.
  • Offers a computationally efficient and accurate alternative for studying complex reaction dynamics.