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Kinetic study of the gas-phase reaction of the nitrate radical with methyl-substituted thiophenes

✍ Scribed by B. Cabañas; P. Martín; S. Salgado; M. T. Baeza; J. Albaladejo; E. Martínez

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
104 KB
Volume
35
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The gas‐phase reactions of the NO~3~ radical with 2‐methylthiophene, 3‐methylthiophene, and 2,5‐dimethylthiophene have been studied, using relative and absolute methods at 298 K. Determination of relative rate was performed using Teflon collapsible bag as the reaction chamber and gas chromatography as the analytical tool. For the absolute method, experiments were carried out using fast‐flow‐discharge technique with detection of NO~3~ by laser‐induced fluorescence. The temperature dependence was studied by the absolute technique for the reactions of NO~3~ with 2‐methylthiophene and 3‐methylthiophene in the range 263–335 K.

The proposed Arrhenius expressions for the reaction of the nitrate radical with 2‐methylthiophene and 3‐methylthiophene are k = (4 ± 2) × 10^−16^ exp[−(2200 ± 100)/T]] cm^3^ molecule^−1^ s^−1^ and k = (3 ± 2) × 10^−15^ exp[−(1700 ± 200)/T]] cm^3^ molecule^−1^ s^−1^, respectively. © 2003 Wiley Periodicals, Inc. Int J Chem Kinet 35: 286–293, 2003

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