Rate Coefficients for the Gas–Phase Reaction of (E)– and (Z)–CF3CF=CFCF3 with the OH Radical and Cl-Atom

Rate coefficients, k, for the gas-phase reaction of the OH radical and Cl-atom with (E)– and (Z)–CF3CF=CFCF3 were measured using a relative rate technique over a range of temperature (240–375 K) and bath gas pressure (50–630 Torr, He). The obtained rate coefficients were found to be independent of pressure under these conditions. The obtained rate coefficients for the reaction of Cl-atom with (E)– and (Z)–CF3CF=CFCF3 at 296 K were k1(296 K) = (7.23 ± 0.3)  10 12 cm3 molecule 1 s 1 and k2(296 K) = (6.70 ± 0.3)  10 12 cm3 molecule 1 s 1, respectively, with the temperature dependence described by the Arrhenius expressions: k1(T) = (3.47  0.35)  10 12 exp[(210  25)/T] cm3 molecule 1 s 1 and k2(T) = (3.37  0.35)  10 12 exp[(199  25)/T] cm3 molecule 1 s 1. The rate coefficients for the OH radical reaction with (E)– and (Z)–CF3CF=CFCF3 were found to be k3(296–375 K) = (4.34  0.45)  10 13 cm3 molecule 1 s 1 and k4(296–375 K) = (3.30  0.35)  10 13 cm3 molecule 1 s 1, respectively. The quoted rate coeff...