Reactions of C$_2$({\it a}$^3Pi_u$) with selected saturated alkanes: A temperature dependence study

Renzhi Hu; Qun Zhang; Yang Chen

doi:10.1063/1.3400070

paper

Reactions of C $_{2}$ ({\it a} $^{3} P i_{u}$ ) with selected saturated alkanes: A temperature dependence study

arXiv:1001.5342 · doi:10.1063/1.3400070

Abstract

We present a temperature dependence study on the gas phase reactions of the C $_{2}$ ({\it a} $^{3} P i_{u}$ ) radical with a selected series of saturated alkanes (C $_{2}$ H $_{6}$ , C $_{3}$ H $_{8}$ , n-C $_{4}$ H $_{1} 0$ , i-C $_{4}$ H $_{1} 0$ , and n-C $_{6}$ H $_{1} 4$ ) by means of pulsed laser photolysis/laser-induced fluorescence technique. The bimolecular rate constants for these reactions were obtained between 298 and 673 K. A pronounced negative temperature effect was observed for n-C $_{4}$ H $_{1} 0$ , i-C $_{4}$ H $_{1} 0$ , and n-C $_{6}$ H $_{1} 4$ and interpreted in terms of steric hindrance of the more reactive secondary or tertiary C-H bonds by less reactive CH $_{3}$ groups. Detailed analysis of our experimental results reveals quantitatively the temperature dependence of reactivities for the primary, secondary, and tertiary C-H bonds in these saturated alkanes and further lends support to a mechanism of hydrogen abstraction.

26 pages, 8 figures, 1 table, 30 references; accepted to JCP

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Reactions of C2​({\it a}3Piu​) with selected saturated alkanes: A temperature dependence study

Abstract

Cited by in corpus (1)

Reactions of C $_{2}$ ({\it a} $^{3} P i_{u}$ ) with selected saturated alkanes: A temperature dependence study