Hydrogen abstration from H,S by CF, radicals, generated by the photolysis of both CF,COCF, and CF,I. has been studied in the temperature range 314-434 K. The rate constant, based on the value of lo', 36 cm3/mol . s for the recombination of CF, radicals, is given by log h, = (12.20 I 0.05) -(19,220 2
The reaction of C2F5 radicals with H2S
โ Scribed by J. E. Bassett; E. Whittle
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 410 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0538-8066
No coin nor oath required. For personal study only.
โฆ Synopsis
The reaction of CzF5 radicals with HzS
(2) C2F5 + HzS -+ CzF5H + HS kfi was studied over the range 1"-123"C using CZFS radicals generated by photolysis of perfluoropropionic anhydride.
The rate constant k~ for reaction (2) is given by where e = 2.303RT/cal mole-'. The relevance of this result to conflicting published data on the analogous reaction between CF, radicals and H2S is discussed. It is concluded that there is little difference in the Arrhenius parameters for reaction of CF3 and CzFs radicals with HZS.
๐ SIMILAR VOLUMES
A mixture of Brz + HBr + CzFsI was photolyzed in the vapor phase. The reaction Br + CzFsI -IBr + CzF5 forms CzFb radicals which are removed by (9) CzFs + Brz -CzFbBr + Br kg (10) CzFs + HBr -CzFsH + Br klo Competitive studies over the range of 74-146'C gave ratios of h l ~/ h s , and these were comb
The hydrogen transfer reaction between C2H6 and CFs radicals, generated by the photolysis of CF31, has been studied in the temperature range 298-617 K. The rate constant, based on the value of 1013 36 cm3 mo1-l s-' for the recombination of CFs radicals, is given by log kp = (11.90 2 0.09) -(33230 \_
C2F5 radicals were generated in the presence of benzene vapor by the reaction (C2FsCO)20 + hv -+ CO + C02 + 2CzFs The radicals react with the benzene by addition and pseudo H abstraction The rate constant k a d d for the addition reaction ( 7) is given by where e = 2.303RT cal/mole and k , is the
Rate constants for the reactions of atomic oxygen ( 0 3 P ) with C&3F, C&IaCl,C@3Br, 1, l-CzHzFz, and I ,2-C&IzFz have been measured at 307' K using a discharge-flow system coupled to a mass spectrometer. The rate constants for these reactions are (in units of 1011cm3mole-1s-1)2.63 &0.38,5.22 =tO0.2