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New Publication in Chemical Physics Letters
Publication from Wuppertal/CRAC collaboration.
An atricle has been published in Chemical Physics Letters based on collaborative work between CRAC and the atmospheric group in Wuppertal, Germany.
Rate coefficients for the gas-phase reaction of hydroxyl (OH) radicals with two methylated benzoquinones have been measured at atmospheric pressure over the temperature range 284–313 K using the relative rate method. The following Arrhenius expressions (in cm3 molecule−1 s−1) have been obtained: k(25DMBQ) = (8.59 ± 4.70) × 10−12exp[(228 ± 163)/T] and k(26DMBQ) = (5.11 ± 2.79) × 10−12exp[(399 ± 165)/T] for 2,5-dimethylbenzoquinone (2,5DMBQ) and 2,6-dimethylbenzoquinone (2,6DMBQ), respectively, with corresponding values at 298 K: k(25DMBQ) = (2.05 ± 0.46) × 10−11 and k(26DMBQ) = (1.93 ± 0.12) × 10−11. The rate coefficients are compared to those reported for similar compounds and discussed in terms of structure–activity relationships. The results are also used to calculate atmospheric lifetimes for 2,5DMBQ and 2,6DMBQ with respect to reaction with OH radicals.