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

Abstract

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 298–550K at a total pressure of 100Torr. 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)cm3molecule−1s−1. The values of the kinetic isotope effect, kH/kD were also estimated.