Rate constants for the reaction of the OH radical with CH3SH and CH3NH2 over the temperature range 299–426 °K

Abstract

Rate constants for reaction of the OH radical with CH3SH and CH3NH2 were determined over the temperature range 299–426 °K by a flash photolysis–resonance fluorescence technique. The Arrhenius expressions obtained were k (CH3SH) =8.89×10−12e(790±300)/RT cm3 molecule−1 sec−1 and k (CH3NH2) =1.02×10−11e(455±300)/RT cm3 molecule−1 sec−1, with rate constants at room temperature of (3.39±0.34) ×10−11 and (2.20±0.22) ×10−11 cm3 molecule−1 sec−1 for CH3SH and CH3NH2, respectively.

Kinetics of OH reactions with furan, thiophene, and tetrahydrothiophene

“…The negative activation energies observed in our studies of reactions (1) and (2) supports the contention that both reactions proceed via addition routes. However, our results do not make it possible to distinguish between the two possible addition pathways for reaction (2). Since Atkinson, Aschmann, and Carter measured k , and k, in air a t atmospheric pressure, the agreement of our results with theirs indicates that there is no dependence of either k l or k2 on O2 concentration.…”

“…The fast rate constants obtained in the discharge flow studies of reactions (1) and (2) (2). They agree that reaction (1) almost certainly proceeds via addition to the carboncarbon double bond and that reaction (2) is also likely to proceed via an addition route; however, there is disagreement concerning whether OH adds to the sulfur atom in thiophene or to a carbon-carbon double bond.…”

“…In this article we report the results of a flash photolysis-resonance fluorescence study of reactions (l), (2), and the reaction of OH with tetrahydrothiophene (THT),…”

A study of the reactions of NO3 radicals with organic sulfides: Reactivity trend at 298 K

“…Like reaction (l), the OH + CH3SH reaction becomes faster as temperature decreases [22,23,38,39], suggesting that the initial step in the mechanism is adduct formation. Also, as appears to occur for reaction (l), the OH + CH3SH reaction is known to give H-abstraction products, i.e., CH3S + H20, with unit yield [40].…”

Size distribution of alkyl amines in continental particulate matter and their online detection in the gas and particle phase

“…The primary sinks of the simple alkyl amines are thought to be oxidation by OH and wet deposition via rain scavenging. Lifetimes for NR 3 against oxidation are on the order of a few hours to a day in the presence of atmospherically relevant concentrations of OH, compared to a month for NH 3 (Atkinson et al, 1977a;Atkinson et al, 1977b;Pitts et al, 1978;Atkinson et al, 1997). Oxidation by O 3 can also be an appreciable sink for secondary and tertiary amines (lifetimes of hours to days) in a polluted environment (Finlayson-Pitts and Pitts, 2000).…”