The Arrhenius Parameters for the Reactions of O Atom with Ethane and Five Fluorothanes

Article abstract of DOI:10.1246/bcsj.58.1228

The rate constants for the reactions of ground-state oxygen atoms with ethene and five fluoroethenes have been measured over the temperature range of 240-450 K, using a pulse radiolysis-resonance absorption technique.The rate constants were well expressed by the following Arrhenius expressions: k(O+C2H4)=8.4x10⁶exp(-712/T); k(O+C2H3F)=3.1x10⁶exp(-622/T); k(O+CH2=CF2)=2.4x10⁶exp(-638/T); k(O+cis-CHF=CHF)=1.9x10⁶exp(-500/T); k(O+C2HF3)=3.0x10⁶exp(-544/T); k(O+C2F4)=8.1x10⁶exp(-634/T), in units of m³mol₁s₁.The change in the preexponential factors with the degree of fluorination is discussed in terms of the conventional transition-state theory.