Browsing by Author "Stone, T. J."

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    Electron Spin Resonance Studies of Photo-oxidation by Metal Ions in Rigid Media at Low Temperatures: Part 4.—Survey of Photo-oxidation by the Uranyl Ion
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (11), 1972) Greatorex, D.; Hill, R. J.; Kemp, T. J.; Stone, T. J.
    The long-standing problem of the mechanism of photo-oxidation of organic and inorganic molecules by the UO2+2 ion has been explored in some detail by the matrix isolation method, the detection of trapped substrate-derived radicals being effected by electron spin resonance spectroscopy, mostly using organic matrices at 77 K. A variety of mechanisms is apparent even within a given homologous series, but the most common feature is abstraction of a hydrogen atom from a carbon atom adjacent to an activating group such as —CO—, —CN, —CO2H, —CHO, —OH, —CONH2, —CO2R or from a phosphorus atom; carbon-carbon cleavage is found (sometimes exclusively) with secondary and tertiary alcohols, ketones, some carboxylic acids and diethyl ether. These results are discussed in the light of recent steady-state studies involving comparison of quantum yield and fluorescence quenching data.