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Kinetic study of the gas‐phase reaction of the nitrate radical with methyl‐substituted thiophenes
Author(s) -
Cabañas B.,
Martín P.,
Salgado S.,
Baeza M. T.,
Albaladejo J.,
Martínez E.
Publication year - 2003
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.10125
Subject(s) - chemistry , arrhenius equation , gas phase , analytical chemistry (journal) , molecule , kinetic energy , gas chromatography , organic chemistry , chromatography , activation energy , physics , quantum mechanics
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