4.6 Article

Rate Coefficient and Mechanism of the OH-Initiated Degradation of 1-Chlorobutane: Atmospheric Implications

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JOURNAL OF PHYSICAL CHEMISTRY A
卷 124, 期 1, 页码 229-239

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AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.9b10426

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  1. CONICET
  2. ANPCyT-FONCyT
  3. SeCyT-UNC
  4. MinCyT-Cordoba

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In this work, we investigate the degradation process of 1-chlorobutane, initiated by OH radicals, under atmospheric conditions (air pressure of 750 Torr and 296 K) from both experimental and theoretical approaches. In the first one, a relative kinetic method was used to obtain the rate coefficient for this reaction, while the products were identified for the first time (1-chloro-2-butanone, 1-chloro-2-butanol, 4-chloro-2-butanone, 3-hydroxy-butanaldehyde, and 3-chloro-2-butanol) using mass spectrometry, allowing suggesting a reaction mechanism. The theoretical calculations, for the reactive process, were computed using the BHandHLYP/6-311++G(d,p) level of theory, and the energies for all of the stationary points were refined at the CCSD(T) level. Five conformers for 1-chlorobutane and 33 reactive channels with OH radicals were found, which were considered to calculate the thermal rate coefficient (as the sum of the site-specific rate coefficients using canonical transition state theory). The theoretical rate coefficient (1.8 x 10(-12) cm(3) molecule(-1) s(-1)) is in good agreement with the experimental value (2.22 +/- 0.50) x 10(-12) cm(3) molecule(-1) s(-1) determined in this work. Finally, environmental impact indexes were calculated and a discussion on the atmospheric implications due to the emissions of this compound into the troposphere was given.

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