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A study of the reactions of NO 3 radicals with organic sulfides: Reactivity trend at 298 K
Author(s) -
Daykin E. P.,
Wine P. H.
Publication year - 1990
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.550221007
Subject(s) - chemistry , reactivity (psychology) , torr , radical , flash photolysis , hydrogen sulfide , hydrogen , hydrogen atom abstraction , photochemistry , kinetics , photodissociation , oxygen , reaction mechanism , absorption (acoustics) , chemical kinetics , analytical chemistry (journal) , reaction rate constant , organic chemistry , thermodynamics , catalysis , sulfur , medicine , physics , alternative medicine , pathology , quantum mechanics , acoustics
A laser flash photolysis‐long path laser absorption technique has been employed to investigate the kinetics of NO 3 reactions with CH 3 SCH 3 ( 1 ), CD 3 SCD 3 ( 2 ), and C 2 H 5 SC 2 H 5 ( 3 ) in 500 torr air at 298 K. The dependence of 1 on total pressure (20–500 torr) and oxygen partial pressure (0—100 torr) has also been investigated, with no dependence observed. Measured rate coefficients in units of 10 −13 cm 3 molecule −1 s −1 are 1 = 13 ± 3, 2 = 3.4 ± 0.8, and 3 = 48 ± 12, where the quoted uncertainties are 2σ estimates of absolute accuracy. The magnitude of NO 3 + sulfide rate coefficients and negative activation energies for 1 (reported by other investigators) suggest that reaction does not proceed via a direct hydrogen abstraction mechanism. However, the reactivity trend observed in this study provides evidence that the reaction mechanism does involve breaking a carbon‐hydrogen bond.