Resumen:
he photolysis of heptafluorobutyric anhydride at 254 nm in the presence of NO2 has been studied. It leads to the formation of CF3CF2CF2OONO2, CF3CF2OONO2, and CF2O as the only fluorine-containing carbonaceous products. The formation of the new heptafluoropropyl peroxynitrate (HFPN, CF3CF2CF2OONO2), as one of the main products, is a consequence of the formation of CF3CF2CF2OO radicals followed by the reaction with NO2. To characterize HFPN, the UV absorption cross sections and their temperature dependence between 245 and 300 K have been measured over the wavelength range 200-300 nm as well as the infrared absorption cross sections. Kinetic parameters for its thermal decomposition are also presented in the temperature range between 281 and 300 K. The Rice-Ramsperger-Kassel-Marcus calculation reveals that the rate coefficient for the thermal decomposition at 285 K is almost independent of total pressure. The mechanism for the decomposition of CF3CF2CF2OONO2 in the presence of NO was adju