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The kinetics of the reactions of C2F5 radicals with Br2 and HBr

✍ Scribed by Brian S. Evans; Eric Whittle

Publisher: John Wiley and Sons
Year: 1981
Tongue: English
Weight: 388 KB
Volume: 13
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550130106

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✦ Synopsis

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 combined with values obtained previously by different methods a t higher temperatures up to 515OC to give log (hlo/129) = (-0.47 f 0.03) -(12,500 f 300)/8

where 0 = 2.303RT J/mol. A value is assigned to the activation energy Elo, and this, with other data, leads t o D(C2Fs -H) = 429.8 f 2.1 kJ/mol at 25°C. This result is in excellent agreement with two previous independent determinations.

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