Abstract
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 298–527K and at a total pressure of 100Torr 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)cm3molecule−1s−1. The kinetic isotope effect, described by the ratio kH/kD, was found to be 3.2 at room temperature.
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