کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5419090 | 1506994 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Theoretical study for the reaction of C2H5Cl/C2D5Cl with Cl atom
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The hydrogen/deuterium abstraction from C2H5Cl/C2D5Cl with chlorine atom has been studied by a dual-level direct dynamics method. Three H-abstraction channels have been identified. The optimized geometries and frequencies of the stationary points and the minimum-energy paths (MEPs) are calculated at the MP2/6-311G(d,p) level of theory. In order to improve the reaction enthalpy and potential barrier, single-point calculations are made at G3 level of theory. Furthermore, the rate constants for the three H-abstraction channels are evaluated using canonical variational transition state theory (CVT) with the small-curvature tunneling correction (SCT) over a wide range of temperature 220-2200Â K at the G3//MP2/6-311G(d,p) level. The calculated rate constants are in reasonable agreement with the experimental values. The kinetic isotope effects for the title reaction are 'normal'. The values of k1a/k2a, k1b/k2b, and k1/k2 are 4.8, 2.3, and 4.5 at room temperature, respectively, and they decrease as the temperature increases. The present theoretical results are expected to be useful and reasonable to estimate the dynamical properties of these reactions over a wide temperature range where no experimental value is available.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 763, Issues 1â3, 28 April 2006, Pages 59-66
Journal: Journal of Molecular Structure: THEOCHEM - Volume 763, Issues 1â3, 28 April 2006, Pages 59-66
نویسندگان
Hong-qing He, Jing-yao Liu, Zeâsheng Li, Chia-chung Sun,