Perfluoro radiolysis

Considerably less work has been done on the kinetic aspects of the radiolysis of fluorine compounds than on other halogen compounds. With °Co y-radiation, perfluoromethane produces perfluoroethane , and perfluoroethane produces (refs. 351, 352) a mixture of perfluoromethane, -propane, -butane, -cyclopropane, and -acetylene. Similar radiolysis studies on perfluorocyclobutane , perfluoro-cyclohexane and other perfluoro-compounds show that the dominant process is one of rupture of the carbon-carbon bond with the formation of a variety of perfluoro-compounds as products. 

The radiation chemistry of polyfluorinated organic compounds has been reviewed and publications have appeared that deal with the following (i) free-radical yields in the radiolysis of gaseous hexafluoroethane (ii) radiolysis free-ion yields and electron ranges in liquid fluoromethanes (CH4- Fn, n = I—4) (iii) ring-opening products of the radiolysis of perfluoro(methylcyclohexane) ... 

W. C. Askew and T. M. Reed, /. Chromatog., 1972, 69, 359. Note that dosimeters based on g.i.e. estimation of perfluorocyclohexane formed by radiolysis of perfluoro-(methylcyclohexane) have been developed [E. Proksch and P. Gehringer, Ber. Oesterr. Studienges. Atomenerg., 1972, CH-84 (Chem. Abs., 1973, 78, 36918e)l. 

The results of further studies on fluorocarbons, particularly perfluoro-cyclohexane, as electron scavengers during y-radiolysis of hydrocarbons have been published. y-Irradiation of solid perfiuorocyclohexane at 77 K has been shown by e.s.r. spectroscopy to produce mainly perfluorocyclohexyl radicals the spectrum given by perfluoro(methylcyclohexane) under the same conditions was not identified, although above 160-170 K the radical... 

Hexafluorobenzene and perfluoro-naphthalene, -biphenyl, and -a-terphenyl have been shown to retain their moderate radiation stability at elevated temperatures perfluorobiphenyl at 500°C is several orders of magnitude more stable thermally and many times more stable to y-radiation than its hydrocarbon analogue. Hexafluorobenzene is as e ent an electron scavenger as perfluorocyclohexane during y-radiolysis of liquid cyclohexane at room temperature. ... 

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