Absolute reaction rate of chlorine atoms with iodomethane

The reaction of atomic chlotine with iodomethane was studied in the gas phase with the very low pressure reactor technique over the temperature range 273–363 K. The absolute rate constant was given by the expression k = (1.33 ± 0.49) × 10−11exp[−(573 ± 1.00 kJ mol−1RT] cm3 molecule−1 s−1. The reaction proceeds through an intermediate weakly bound adduct CH3ICl and results in the formation of HCl and iodomethyl radical CH2I. The kinetic isotope effect kHkD of the reaction was independent of temperature and found to be 1.09 ± 0.4.