Influence of Multiple Conformations and Paths on Rate Constants and Product Branching Ratios. Thermal Decomposition of 1-Propanol Radicals
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Title: | Influence of Multiple Conformations and Paths on Rate Constants and Product Branching Ratios. Thermal Decomposition of 1-Propanol Radicals |
Author: | Ferro Costas, David Martínez Núñez, Emilio Rodríguez Otero, Jesús Cabaleiro Lago, Enrique Manuel Estévez, Carlos M. Fernández Rodríguez, Berta Fernández Ramos, Antonio Vázquez Rodríguez, Saulo Angel |
Affiliation: | Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares Universidade de Santiago de Compostela. Departamento de Química Física |
Date of Issue: | 2018-05-15 |
Publisher: | American Chemical Society |
Citation: | Ferro-Costas, D., Martínez-Núñez, E., Rodríguez-Otero, J., Cabaleiro-Lago, E., Estévez, C., & Fernández, B. et al. (2018). Influence of Multiple Conformations and Paths on Rate Constants and Product Branching Ratios. Thermal Decomposition of 1-Propanol Radicals. The Journal Of Physical Chemistry A, 122(21), 4790-4800. doi: 10.1021/acs.jpca.8b02949 |
Abstract: | The potential energy surface involved in the thermal decomposition of 1-propanol radicals was investigated in detail using automated codes (tsscds2018 and Q2DTor). From the predicted elementary reactions, a relevant reaction network was constructed to study the decomposition at temperatures in the range 1000–2000 K. Specifically, this relevant network comprises 18 conformational reaction channels (CRCs), which in general exhibit a large wealth of conformers of reactants and transition states. Rate constants for all the CRCs were calculated using two approaches within the formulation of variational transition-state theory (VTST), as incorporated in the TheRa program. The simplest, one-well (1W) approach considers only the most stable conformer of the reactant and that of the transition state. In the second, more accurate approach, contributions from all the reactant and transition-state conformers are taken into account using the multipath (MP) formulation of VTST. In addition, kinetic Monte Carlo (KMC) simulations were performed to compute product branching ratios. The results show significant differences between the values of the rate constants calculated with the two VTST approaches. In addition, the KMC simulations carried out with the two sets of rate constants indicate that, depending on the radical considered as reactant, the 1W and the MP approaches may display different qualitative pictures of the whole decomposition process |
Publisher version: | https://doi.org/10.5944/10.1021/acs.jpca.8b02949 |
URI: | http://hdl.handle.net/10347/16918 |
DOI: | 10.1021/acs.jpca.8b02949 |
ISSN: | 1089-5639 |
E-ISSN: | 1520-5215 |
Rights: | © 2018 American Chemical Society |
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