Photolysis of acetaldehyde in presence of nitric oxide
- 1 January 1969
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1134-1138
- https://doi.org/10.1039/j19690001134
Abstract
The initial rate of formation of nitrogen dioxide during and after the photolysis of acetaldehyde + nitric oxide mixtures is compared with that in the corresponding acetone system. It is shown that the thermal disproportionation of nitric oxide by the unstable species nitrosoacetaldehyde (CH3·CONO) exhibits a decrease in order with respect to nitric oxide as the pressure of nitric oxide increases, and this effect is discussed. The dependence of the rate of production of nitrogen dioxide on the pressure of acetaldehyde and on Ia, the absorbed light, indicates that there are at least two sources of CH3·CONO in the acetaldehyde system. It is suggested that a reaction of an excited singlet state of acetaldehyde leads to CH3·CONO and that the intermediate, with a life-time of several seconds, formed by the reaction of triplet-state acetaldehyde with nitric oxide, also decomposes to produce CH3·CONO. The latter source is responsible for the dark reaction observed.Keywords
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