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Issue 3, 2003
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Kinetic and mechanistic study of Cl reactions with aliphatic thiols. Temperature dependence

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Abstract

The mass spectrometric discharge-flow method has been used to investigate the kinetics, mechanism and products of Cl atoms reactions with different aliphatic thiols, CH3CH2SH (1), CH3CH2CH2SH (2) and (CH3)2CHSH (3) over the temperature range 260–333 K and at low total pressure of 1 Torr. The reactions have been studied under pseudo-first order kinetic conditions in excess of organic compounds over Cl atoms. Arrhenius expressions which describe our results are (units in 10−10 cm3 molecule−1 s−1): k(1) = (3.1 ± 0.7)exp[(−136 ± 70)/T], k(2) = (5.4 ± 2.1)exp[(−227 ± 131)/T] and k(3) = (4.1 ± 1.0)exp[(−125 ± 21)/T]. The mechanisms of the reactions are discussed. The results obtained are related to previous studies of aliphatic thiols with other tropospheric agents and the atmospheric implications are also discussed in relation to the homogeneous sinks of these organic compounds.

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Article information


Submitted
24 Jun 2002
Accepted
16 Dec 2002
First published
03 Jan 2003

Phys. Chem. Chem. Phys., 2003,5, 514-519
Article type
Paper

Kinetic and mechanistic study of Cl reactions with aliphatic thiols. Temperature dependence

D. Rodríguez, A. Aranda, Y. Díaz de Mera, B. Ballesteros and E. Martínez, Phys. Chem. Chem. Phys., 2003, 5, 514
DOI: 10.1039/B206096P

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