Ir matrix isolation spectra of some perfluoro organic free radicals. Part III. n-C3F7 and iso-C3F7

The perfluoro radicals n-C₃F₇ and iso-C₃F₇ have been prepared by pyrolyzing the corresponding iodides in a platinum effusion tube at temperatures between 450–550°C and isolated in argon matrices. By eliminating absorption bands attributed to known fluorine compounds and applying relative absorption band intensity correlations, several absorption bands have been assigned, some 30 to n-C₃F₇ and 29 to iso-C₃Fe₇, in the spectral range 2000–200 cm^-1. A tentative vibrational assignment is presented for both species on the assumption of C_s symmetry. Some thermodynamic implications of the findings are also discussed.