Kinetic study of the reaction of chlorine atoms with bromoethane and D-bromoethane in the gas phase

The kinetics of the gas-phase reactions of chlorine atoms with bromoethane (C2H5Br) and D-bromoethane (C2D5Br) was studied experimentally. The relative rate method was applied using Cl + C2H6 as the reference reaction. The rate constants for H-abstraction from C2H5Br (kH) and D-abstraction from C2D5Br (kD) were measured in the temperature range of 298–527 K and at a total pressure of 100 Torr using N2 as a diluent. The temperature dependencies of the rate constants are described by the expressions: kH = (2.6 ± 0.3) × 10−11 × exp(−390 ± 35/T) and kD = (2.8 ± 0.2) × 10−11 × exp(−750 ± 30/T) cm3 molecule−1 s−1. The kinetic isotope effect, described by the ratio kH/kD, was found to be 3.2 at room temperature.