The Photolysis of Azomethane in the Presence of Hydrogen

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Abstract
The photolysis of azomethane in presence of hydrogen in the temperature range 20–200°C has been shown to yield ethane at a rate which is independent of the hydrogen. At low temperatures methane production is decreased by the presence of hydrogen but the rate increases with temperature faster than from azomethane alone. A mechanism involving CH5 has been suggested which accounts qualitatively for the observations. Essentially the same mechanism is shown to account for the decomposition of mercury dimethyl, roughly quantitatively. Strong evidence is offered that the reaction producing methane from methyl radicals and hydrogen is not CH3+H2→CH4+H. This is supported by the absence of hydrogen atoms during the azomethane photolysis studied.
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