Rate constants for the reaction of OH radicals with a series of alkenes and dialkenes at 295 ± 1 K

✍ Scribed by Roger Atkinson; Sara M. Aschmann

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 570 KB
• Volume: 16
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550161002

✦ Synopsis

Using a relative rate technique, rate constants for the gas phase reactions of the OH radical with n-butane, n-hexane, and a series of alkenes and dialkenes, relative to that for propene, have been determined in one atmosphere of air at 295 f 1 K. The rate constant ratios obtained were (propene = 1.00): ethene, 0.323 2 0.014; 1-butene, 1.19 i 0.06; 1-pentene, 1.19 2 0.05; 1-hexene, 1.40 0.04; 1-heptene, 1.51 2 0.06; 3-methyl-1-butene, 1.21 2 0.04; isobutene, 1.95 2 0.09; cis-2-butene, 2.13 2 0.05; trans-2-butene, 2.43 2 0.05; 2-methyl-2-butene, 3.30 2 0.13; 2,3-dimethyl-2-butene, 4.17 i 0.18; propadiene, 0.367 0.036; 1,3-butadiene, 2.53 2 0.08; 2-methyl-1,3butadiene, 3.81 2 0.15; n-butane, 0.101 2 0.012; and n-hexane, 0.198 ? 0.017. From a least-squares fit of these relative rate data to the most reliable literature absolute flash photolysis rate constants, these relative rate constants can be placed on an absolute basis using a rate constant for the reaction of OH radicals with propene of 2.63 x lo-" cm3 molecule-' s-'. The resulting rate constant data, together with previous relative rate data from these and other laboratories, lead to a self-consistent data set for the reactions of OH radicals with a large number of organics at room temperature.