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Updated: Jun 7, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
From synchronous to sequential double proton transfer: quantum dynamics simulations for the model porphine
Antonio Accardi1, Ingo Barth, Oliver Kühn
1Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany.
Quantum dynamics simulations show that double proton transfer (DPT) can switch mechanisms from synchronous to sequential. This finding, observed in a model porphine system, offers new insights into chemical reaction pathways.
Area of Science:
- Quantum chemistry
- Chemical dynamics
- Spectroscopy
Background:
- Double proton transfer (DPT) is a fundamental process in chemistry and biology.
- Understanding the mechanisms of DPT is crucial for various chemical reactions.
Purpose of the Study:
- To investigate the possibility of switching between synchronous and sequential mechanisms in DPT.
- To analyze the wavepacket dynamics during DPT in a model porphine system.
Main Methods:
- Quantum dynamics simulations were performed on a model porphine system.
- Nonequilibrium initial states were used to initiate the simulations.
- Analysis included wavepacket densities, flux densities, populations, net fluxes, and domain-to-domain fluxes.
Main Results:
- A switch from synchronous to sequential DPT was demonstrated.
- Wavepacket dispersion and reflections from the potential energy surface mediate this mechanism switch.
- Minor effects like direct mechanism switching and damped oscillations were also observed.
Conclusions:
- The study provides a proof of principle for mechanism switching in DPT.
- Wavepacket dynamics and potential energy surface features play critical roles in determining reaction pathways.
- This research contributes to a deeper understanding of complex chemical reaction dynamics.
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