Kinetic study of the reactions of CF₃O₂ radicals with Cl and NO

Abstract

Kinetic studies of the reactions CF₃O₂+Cl and CF₃O₂+NO were performed at room temperature in the gas phase using the discharge flow mass spectrometric technique (DFMS). The reactions were investigated under pseudo-first-order conditions with Cl or NO in large excess with respect to the CF₃O₂ radicals. The rate constant for the reaction CF₃O₂+NO was measured at 298 K and the value of (1.6±0.3)×10^-11 cm³ molecule^-1 s^-1 is in very good agreement with all previous values. For the reaction CF₃O₂+Cl, we obtain a rate constant at 298 K of (4.2±0.8)×10^-11 cm³ molecule^-1 s^-1 in excellent agreement with the only published value. Product analysis shows that this reaction occurs via the major reaction pathway CF₃O₂+Cl→CF₃O+ClO at room temperature. In addition, an abinitio theoretical study was performed to gain insights on the different postulated reaction pathways. There is a significant disagreement between experimental and abinitio values recommended for the formation enthalpies of CF₂O, CF₃O and related molecules produced in this system. Consequently, we provide self-consistent values of enthalpies based on isodesmic reactions for the CF₃O₂+Cl reaction system using the G2, G2(MP2) and CBS-Q methods. These values are also compared with BAC-MP4 heats of formation calculated in this work.

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