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Radical-molecule reactions HCO/HOC + C2H2: mechanistic study
Hao Dong1, Yi-hong Ding, Chia-chung Sun
1State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.
The Journal of Physical Chemistry. A
|December 22, 2005
Summary
The study reveals that the HOC + acetylene reaction readily forms products, suggesting its importance in combustion and interstellar chemistry. The HCO + acetylene reaction is less favorable, requiring higher temperatures to proceed.
Area of Science:
- Chemical Kinetics
- Theoretical Chemistry
- Astrochemistry
Background:
- Radical-molecule reactions are crucial in combustion and interstellar environments.
- Understanding reaction pathways and barriers is key to predicting chemical processes.
Purpose of the Study:
- To computationally investigate the reaction mechanisms of HCO and HOC radicals with acetylene.
- To determine the dominant reaction pathways and energy barriers for these reactions.
- To assess the potential role of these reactions in combustion and interstellar chemistry.
Main Methods:
- High-level computational chemistry methods, including CCSD(T) and Gaussian-3.
- Utilized B3LYP and MP2 levels of theory for electronic structure calculations.
- Calculated reaction pathways, intermediates, and transition states.
Main Results:
- The HOC + C2H2 reaction proceeds barrierlessly via H-donation, forming C2H3 + CO.
- The HCO + C2H2 reaction has a higher barrier via C-addition, becoming significant only at elevated temperatures.
- The study explored the potential formation of propadiene and propynal.
Conclusions:
- The HOC + C2H2 reaction is likely important in combustion and interstellar processes due to its low-energy pathway.
- The HCO + C2H2 reaction is less significant under typical conditions.
- Further laboratory studies are recommended, especially for the HOC + C2H2 reaction.