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Issue 15, 2010
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Low temperature rate coefficients for reactions of the butadiynyl radical, C4H, with various hydrocarbons. Part II: reactions with alkenes (ethylene, propene, 1-butene), dienes (allene, 1,3-butadiene) and alkynes (acetylene, propyne and 1-butyne)

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Abstract

The kinetics of the reactions of the linear butadiynyl radical, C4H (CCCCH), with a variety of unsaturated hydrocarbons have been studied over the temperature range of 39–300 K using a CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme, or reaction kinetics in uniform supersonic flow) apparatus combined with the pulsed laser photolysis–laser induced fluorescence technique. The rate coefficients for all the reactions studied are found to all be in excess of 10−10 cm3 molecule−1 s−1 over the entire temperature range. They can be fitted with the following expressions (valid from 39 K to 300 K, with RMS deviations of the experimental points from the predicted values shown, to which should be added 10% possible systematic error) for reaction of C4H with alkenes: kC2H4 = (1.95 ± 0.17) × 10−10 (T/298 K)−0.40 exp(9.4 K/T) cm3 molecule−1 s−1;kC3H6 = (3.25 ± 0.12) × 10−10 (T/298 K)−0.84 exp(−48.9 K/T) cm3 molecule−1 s−1;k1-C4H8 = (6.30 ± 0.35) × 10−10 (T/298 K)−0.61 exp(−65.0 K/T) cm3 molecule−1 s−1,for reaction of C4H with dienes:kC3H4 = (3.70 ± 0.34) × 10−10 (T/298 K)−1.18 exp(−91.1 K/T) cm3 molecule−1 s−1;k1,3-C4H6 = (5.37 ± 0.30) × 10−10 (T/298 K)−1.25 exp(−116.8 K/T) cm3 molecule−1 s−1,and for reaction of C4H with alkynes: kC2H2 = (1.82 ± 0.19) × 10−10 (T/298 K)−1.06 exp(−65.9 K/T) cm3 molecule−1 s−1;kC3H4 = (3.20 ± 0.08) × 10−10 (T/298 K)−0.82 exp(−47.5 K/T) cm3 molecule−1 s−1;k1-C4H6 = (3.48 ± 0.14) × 10−10 (T/298 K)−0.65 exp(−58.4 K/T) cm3 molecule−1 s−1.Possible reaction mechanisms and product channels are discussed in detail for each of these reactions. Potential implications of these results for models of low temperature chemical environments, in particular cold interstellar clouds and star-forming regions, are considered.

Graphical abstract: Low temperature rate coefficients for reactions of the butadiynyl radical, C4H, with various hydrocarbons. Part II: reactions with alkenes (ethylene, propene, 1-butene), dienes (allene, 1,3-butadiene) and alkynes (acetylene, propyne and 1-butyne)

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Publication details

The article was received on 12 Nov 2009, accepted on 08 Feb 2010 and first published on 19 Mar 2010


Article type: Paper
DOI: 10.1039/B923867K
Citation: Phys. Chem. Chem. Phys., 2010,12, 3677-3689
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    Low temperature rate coefficients for reactions of the butadiynyl radical, C4H, with various hydrocarbons. Part II: reactions with alkenes (ethylene, propene, 1-butene), dienes (allene, 1,3-butadiene) and alkynes (acetylene, propyne and 1-butyne)

    C. Berteloite, S. D. Le Picard, N. Balucani, A. Canosa and I. R. Sims, Phys. Chem. Chem. Phys., 2010, 12, 3677
    DOI: 10.1039/B923867K

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