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Kinetics of the reactions of OH radicals with 2‐methoxy‐6‐(trifluoromethyl)pyridine, diethylamine, and 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol at 298 ± 2 K
Author(s) -
Tuazon Ernesto C.,
Martin Pilar,
Aschmann Sara M.,
Arey Janet,
Atkinson Roger
Publication year - 2011
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.20594
Subject(s) - chemistry , diethylamine , trifluoromethyl , radical , pyridine , reaction rate constant , medicinal chemistry , photochemistry , kinetics , organic chemistry , alkyl , physics , quantum mechanics
Rate constants for the reactions of 2‐methoxy‐6‐(trifluoromethyl)pyridine, diethylamine, and 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol with OH radicals have been measured at 298 ± 2 K using a relative rate method. The measured rate constants (cm 3 molecule −1 s −1 ) are (1.54 ± 0.21) × 10 −12 for 2‐methoxy‐6‐(trifluoromethyl)pyridine, (1.19 ± 0.25) × 10 −10 for diethylamine, and (1.76 ± 0.38) × 10 −12 for 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol, where the indicated errors are the estimated overall uncertainties including those in the rate constants for the reference compounds. No reaction of 2‐methoxy‐6‐(trifluoromethyl)pyridine with gaseous nitric acid was observed, and an upper limit to the rate constant for the reaction of 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol with O 3 of <7 × 10 − 20 cm 3 molecule −1 s −1 was determined. Using a 12‐h average daytime OH radical concentration of 2 × 10 6 molecule cm −3 , the lifetimes of the volatile organic compounds studied here with respect to reaction with OH radicals are 7.5 days for 2‐methoxy‐6‐(trifluoromethyl)pyridine, 1.2 h for diethylamine, and 6.6 days for 1,1,3,3,3‐pentamethyldisiloxan‐1‐ol. Likely reaction mechanisms are discussed. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 631–638, 2011