Temperature dependence of the kinetic isotopic effect of the reaction of Cl atoms with C2H5Cl between 298 and 550 K

The kinetics of the gas-phase reactions of chlorine atoms with chloroethane and chloroethane-d5 was studied experimentally. The relative rate method was applied using Cl + CH3Cl as the reference reaction. The overall rate constants for H-abstraction from C2H5Cl (kH), D-abstraction from C2D5Cl (kD), the site-specific rate constants for H-abstraction from α-carbon (kH,α) and β-carbon (kH,β) atoms of C2H5Cl were measured in the temperature range of 298–550 K at a total pressure of 100 Torr. The derived temperature dependencies of the rate constants are given by kH = (2.41 ± 0.21) × 10−11 × exp(−316 ± 11/T), kH,α = (1.36 ± 0.09) × 10−11 × exp(−202 ± 8/T), kH,β = (1.14 ± 0.11) × 10−11 × exp(−592 ± 16/T) and kD = (1.58 ± 0.14) × 10−11 × exp(−474 ± 13/T) cm3 molecule−1 s−1. The values of the kinetic isotope effect, kH/kD were also estimated.