Atmospheric chemistry for gas-phase reactions of cyc-CF₂CF₂CF₂CHXCHX– (X = H or F) with OH radicals in the temperature range of 253–328 K

Rate constants for the gas-phase reactions of cyc-CF₂CF₂CF₂CH₂CH₂– with the OH radicals were assessed by a relative rate method in the temperature range of 253–328 K, from which k₁(T) = (8.52 ± 1.58) × 10⁻¹³ exp [(–1017 ± 53)/T] was derived for the Arrhenius equation. Its atmospheric lifetime was 1.6 years. The estimated photochemical ozone creation potentials (POCP) were 0.211 and 0.076 for North-west European and USA urban conditions, respectively. The radiative efficiency (RE) was measured as 0.200 W m⁻² ppb⁻¹, and the global warming potential (GWP) of the 100-year time horizon was estimated to be 107. The atmospheric oxidation mechanism of cyc-CF₂CF₂CF₂CH₂CH₂– was studied by the experimental method. COF₂, CO, and CO₂ were identified as the main carbon-containing products. Additionally, the degradation mechanism of two analogous compounds, cyc-CF₂CF₂CF₂CHFCH₂– and cis-cyc-CF₂CF₂CF₂CHFCHF–, were also investigated. COF₂, HC(O)F, CO, and CO₂ were observed as the main products.