The fate of the hydrocarbon fragments in the phototarnishing of silver by several gaseous alkyl iodides (RI) is reported. The only gaseous product of reaction is the dimer alkane (R—R). Reaction rates depend linearly on light intensity, and the rate of alkane production was unaffected by the presence of a gaseous radical scavenger. The results obtained are consistent with a mechanism previously proposed for phototarnishing.
R. F. Cross, P. T. McTigue and D. J. Young, Trans. Faraday Soc., 1969, 65, 3355 DOI: 10.1039/TF9696503355
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