https://scholars.lib.ntu.edu.tw/handle/123456789/606906
標題: | Kinetic insights into ethynyl radical with isobutane and neopentane | 作者: | Dash M.R Muthiah B Mishra S.S Annaraj B Lin K.-C. KING-CHUEN LIN |
關鍵字: | Ethynyl radicals;M06-2X;Potential energy surface;Rate constants;Transition state | 公開日期: | 2021 | 卷: | 140 | 期: | 10 | 來源出版物: | Theoretical Chemistry Accounts | 摘要: | The rate constants of ethynyl (C2H) radical reaction with isobutane (kiso) and neopentane (kneo) were calculated for the first time using canonical variational transition state theory (CVT) with small-curvature tunneling (SCT) in the temperature range of 150–5000?K. The geometries and frequencies of all the stationary points were calculated at the M06-2X/Aug-cc-pVTZ level of theory. Thermodynamics (ΔH°298 and ΔG°298) results govern that the title reactions are highly exothermic and spontaneous in nature. The rate constants obtained over the temperature range of 150–300?K were used to derive the modified Arrhenius expressions: kiso = 6.84 × 10–19 T2.5 exp[1496/T] and kneo = 1.72 × 10–17 T2.0 exp[938/T] cm3 molecule?1?s?1. Branching ratio calculation for the reaction of C2H radical with isobutane shows that the tertiary-H abstraction channel is dominant (> 95%) over the complete temperature range. ? 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85114299202&doi=10.1007%2fs00214-021-02833-x&partnerID=40&md5=f64d23440cf3cd7b7e55d5c637a021e9 https://scholars.lib.ntu.edu.tw/handle/123456789/606906 |
ISSN: | 1432881X | DOI: | 10.1007/s00214-021-02833-x |
顯示於: | 化學系 |
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