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Lauraguais A, El Zein A, Coeur C, et al. Kinetic Study of the Gas-Phase Reactions of Nitrate Radicals with Methoxyphenol Compounds: Experimental and Theoretical Approaches. J Phys Chem A. 2016;120(17):2691-9doi: 10.1021/acs.jpca.6b02729.
Lauraguais, A., El Zein, A., Coeur, C., Obeid, E., Cassez, A., Rayez, M. T., & Rayez, J. C. (2016). Kinetic Study of the Gas-Phase Reactions of Nitrate Radicals with Methoxyphenol Compounds: Experimental and Theoretical Approaches. The journal of physical chemistry. A, 120(17), 2691-9. https://doi.org/10.1021/acs.jpca.6b02729
Lauraguais, Amélie, et al. "Kinetic Study of the Gas-Phase Reactions of Nitrate Radicals with Methoxyphenol Compounds: Experimental and Theoretical Approaches." The journal of physical chemistry. A vol. 120,17 (2016): 2691-9. doi: https://doi.org/10.1021/acs.jpca.6b02729
Lauraguais A, El Zein A, Coeur C, Obeid E, Cassez A, Rayez MT, Rayez JC. Kinetic Study of the Gas-Phase Reactions of Nitrate Radicals with Methoxyphenol Compounds: Experimental and Theoretical Approaches. J Phys Chem A. 2016 May 05;120(17):2691-9. doi: 10.1021/acs.jpca.6b02729. Epub 2016 Apr 25. PMID: 27073983.
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J Phys Chem A. 2016 May 05;120(17):2691-9. doi: 10.1021/acs.jpca.6b02729. Epub 2016 Apr 25.

Kinetic Study of the Gas-Phase Reactions of Nitrate Radicals with Methoxyphenol Compounds: Experimental and Theoretical Approaches.

The journal of physical chemistry. A

Amélie Lauraguais, Atallah El Zein, Cécile Coeur, Emil Obeid, Andy Cassez, Marie-Thérèse Rayez, Jean-Claude Rayez

Affiliations

  1. Université Lille Nord de France , 59658 Villeneuve d'Ascq Cedex, France.
  2. Laboratoire de Physico-Chimie de l'Atmosphère, EA 4493, l'Université du Littoral Côte d'Opale , 62893 Wimereux, France.
  3. Université de Bordeaux, ISM, UMR 5255 , F-33400 Talence, France.
  4. CNRS, ISM, UMR 5255 , F-33400 Talence, France.

PMID: 27073983 DOI: 10.1021/acs.jpca.6b02729

Abstract

The gas-phase reactions of five methoxyphenols (three disubstituted and two trisubstituted) with nitrate radicals were studied in an 8000 L atmospheric simulation chamber at atmospheric pressure and 294 ± 2 K. The NO3 rate constants were investigated with the relative kinetic method using PTR-ToF-MS and GC-FID to measure the concentrations of the organic compounds. The rate constants (in units of cm(3) molecule(-1) s(-1)) determined were: 2-methoxyphenol (guaiacol; 2-MP), k(2-MP) = (2.69 ± 0.57 × 10(-11); 3-methoxyphenol (3-MP), k(3-MP) = (1.15 ± 0.21) × 10(-11); 4-methoxyphenol (4-MP), k(4-MP) = (13.75 ± 7.97) × 10(-11); 2-methoxy-4-methylphenol, k(2-M-4-MeP) = (8.41 ± 5.58) × 10(-11) and 2,6-dimethoxyphenol (syringol; 2,6-DMP), k(2,6-DMP) = (15.84 ± 8.10) × 10(-11). The NO3 rate constants of the studied methoxyphenols are compared with those of other substituted aromatics, and the differences in the reactivity are construed regarding the substituents (type, number and position) on the aromatic ring. This study was also supplemented by a theoretical approach of the methoxyphenol reactions with nitrate radicals. The upper limits of the NO3 overall rate constants calculated were in the same order of magnitude than those experimentally determined. Theoretical calculations of the minimum energies of the adducts formed from the reaction of NO3 radicals with the methoxyphenols were also performed using a DFT approach (M06-2X/6-31G(d,p)). The results indicate that the NO3 addition reactions on the aromatic ring of the methoxyphenols are exothermic, with energy values ranging between -13 and -21 kcal mol(-1), depending on the environment of the carbon on which the oxygen atom of NO3 is attached. These energy values allowed identifying the most suitable carbon sites for the NO3 addition on the aromatic ring of the methoxyphenols: at the exception of the 3-MP, the NO3 ipso-addition to the hydroxyl group is one of the favored sites for all the studies compounds.

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