OH Reactivity and UV Spectra of Propane, n-Propyl Bromide, and Isopropyl Bromide

Published

March 1, 2003

Author(s)

S N. Kozlov, Vladimir L. Orkin, Robert E. Huie, Michael J. Kurylo III

Abstract

The rate constants for the reactions of OH radicals with the 1-bromopropane, 2-bromopropane, and propane were measured using the flash photolysis reasonance fluorescence technique over the temperature range between 210 K and 480 K. Arrhenius plots exhibit a noticeable curvature and the rate constants can be represented using a three parameter modified Arrhenius expression over the temperature range of the experiments with ca. 2% precision. Such a fit also describes the available high temperature data for propane quite well. The best three parameter fits to the data are:k_C3H8 (T) = 1.90x10^-12x(T/298)^1.87 xexp{-158/5}, cm³ molecule^-1 s^-1,k_nPB(T)=2.99x10^-13x(T/298)^2.79 xexp{+369/T}, cm³ molecule^-1 s^-1,k_nPB(T) =1.66x10^-13x(T/298)^2.95 xexp{+461/T}, cm³ molecule^-1 s^-1.For the low temperature range of atmospheric interest the reaction rate constants can be accurately presented by standard Arrhenius expressions. Based on the available low temperature data the following rate constants can be recommended for the purpose of atmospheric modeling:k_C3H8 (T -12 exp{-615/T} cm³ molecule^-1 X^-1,k_nPB (T -12 exp{-330/T) cm³ molecule^-1 s^-1,k_iPB(T -12 exp{260/T} cm³ molecule^-1 s^-1.Atmospheric lifetimes were estimated to be ca. 14, 14, and 18 days for CH₃CH₂CH₃, CH₂BrCH₂CH₃, and CH₃CHBrCH₃, respectively. Ultraviolet absorption spectra of these bromopropanes were measured between 164 nm and 280 nm.

Citation

Journal of Physical Chemistry A

Volume

107

Issue

No. 9

Pub Type

Journals

Keywords

atmospheric lifetime, haloakene, hydroxyl radical, iso-propyl bromide, n-propyl bromide, propane, ultraviolet spectra

Citation

Kozlov, S. , Orkin, V. , Huie, R. and Kurylo, M. (2003), OH Reactivity and UV Spectra of Propane, n-Propyl Bromide, and Isopropyl Bromide, Journal of Physical Chemistry A (Accessed April 23, 2024)