Rate coefficients of hydroxyl radical reaction with 1-chlorocyclopentene over a temperature range of 262–335 K

The rate coefficients for reactions of 1-chlorocyclopentene with OH have been measured in the temperature range of 262–335 K, at total pressure of 30 Torr, using Laser Photolysis-Laser Induced Fluorescence. The rate coefficient can be expressed as k(T)=(6.32 ± 1.16) × 10-12 exp((669 ± 45)/T) cm3molecules-1s−1, and thus it depends weakly on temperature. It decreases with increasing temperature, which was attributed to formation of a pre-reactive complex between reactants. Molecular orbital calculations confirm participation of such a complex during an addition reaction, and also predict several other hydrogen abstraction pathways. The studies suggest the dominance of addition reaction over H atom abstraction in the reaction of 1-chlorocyclopentene with OH.