TY - JOUR
T1 - Dissociation Time, Quantum Yield, and Dynamic Reaction Pathways in the Thermolysis of trans-3,4-Dimethyl-1,2-dioxetane
AU - Zhou, Jian Ge
AU - Shu, Yinan
AU - Wang, Yuchen
AU - Leszczynski, Jerzy
AU - Prezhdo, Oleg
N1 - Publisher Copyright:
© 2024 The Authors. Published by American Chemical Society.
PY - 2024/2/22
Y1 - 2024/2/22
N2 - The thermolysis of trans-3,4-dimethyl-1,2-dioxetane is studied by trajectory surface hopping. The significant difference between long and short dissociation times is rationalized by frustrated dissociations and the time spent in triplet states. If the C-C bond breaks through an excited state channel, then the trajectory passes over a ridge of the potential energy surface of that state. The calculated triplet quantum yields match the experimental results. The dissociation half-times and quantum yields follow the same ascending order as per the product states, justifying the conjecture that the longer dissociation time leads to a higher quantum yield, proposed in the context of the methylation effect. The populations of the molecular Coulomb Hamiltonian and diagonal states reach equilibrium, but the triplet populations with different Sz components fluctuate indefinitely. Certain initial velocities, leading the trajectories to given product states, can be identified as the most characteristic features for sorting trajectories according to their product states.
AB - The thermolysis of trans-3,4-dimethyl-1,2-dioxetane is studied by trajectory surface hopping. The significant difference between long and short dissociation times is rationalized by frustrated dissociations and the time spent in triplet states. If the C-C bond breaks through an excited state channel, then the trajectory passes over a ridge of the potential energy surface of that state. The calculated triplet quantum yields match the experimental results. The dissociation half-times and quantum yields follow the same ascending order as per the product states, justifying the conjecture that the longer dissociation time leads to a higher quantum yield, proposed in the context of the methylation effect. The populations of the molecular Coulomb Hamiltonian and diagonal states reach equilibrium, but the triplet populations with different Sz components fluctuate indefinitely. Certain initial velocities, leading the trajectories to given product states, can be identified as the most characteristic features for sorting trajectories according to their product states.
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U2 - 10.1021/acs.jpclett.3c03578
DO - 10.1021/acs.jpclett.3c03578
M3 - Article
C2 - 38334951
AN - SCOPUS:85183795658
SN - 1948-7185
VL - 15
SP - 1846
EP - 1855
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 7
ER -