Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science

Reactions of trifluoromethyl radicals. II. Hydrogen abstraction from monochlorosilane

NL Arthur and BR Harman

Australian Journal of Chemistry 26(6) 1269 - 1275
Published: 1973


Hydrogen atom abstraction from SiH3Cl by CF3 radicals                   CF3 + SiH3Cl → CF3H+SiH2Cl                    (1) has been studied in the temperature range 69-168°. The rate constant, based on Ayscough's value of 1013.36 cm3 mol-1 s-1 for the recombination of CF3 radicals, is given by (k1 in cm3 mol-1 s-1, E in kJ mol-1):                    logk1 = (12.38±0.06)-(25.72±0.41)/2.303RT At 400 K, the rate constant for CF3 + SiH3Cl is greater than the average value reported for CF3+SiHCl3 by a factor of 3.6. This is due to a difference in A factors since the activation energies are equal within experimental error.

© CSIRO 1973

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