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Photolysis of 1,1,1-difluorochloroethane (Freon 142) at 147 nm

✍ Scribed by T. Ichimura; A. W. Kirk; E. Tschuikow-Roux

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
407 KB
Volume
9
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

1,1,1‐Difluorochloroethane (Freon 142) was photolyzed at 147 nm in the pressure range of 3.6–20.6 torr. The effects of added NO, H~2~S, and CF~4~ were investigated. The extinction coefficient at 147 nm and 296°K was determined to be 64 ± 8 atm^−1^ · cm^−1^.

The molecule photodecomposes largely by α,β elimination of HCl to give 1,1‐difluoroethylene (Φ = 0.74 ± 0.06). There is no observable elimination of HF, but there is strong evidence for the elimination of the elements of FCl though the relative importance of this process is minor, as are contributions from carboncarbon and carbonhalogen bond fission.

The 1,1‐difluoroethylene formed is undoubtedly vibratonally excited and is the source of a pressure‐dependent small yield of fluoroacetylene. Over the pressure range studied there is no evidence that the major primary process itself is affected by changes in total pressure as is the case in the 147‐nm photolysis of ethyl chloride.

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