Browsing by Author "Sinclair, Roy S."

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    Absorption Spectra of Radical Ions of Polyenes of Biological Interest
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (03), 1977) Land, Edward J.; Lafferty, Joseph; Sinclair, Roy S.; Truscott, T. George
    The radical cations and anions of a number of carbonyl containing polyenes of biological importance have been generated, and their absorptions characterised using pulse radiolysis techniques. The wavelength maxima of the absorption bands are linearly dependent on the number of conjugated double bonds. The radical cation and the radical anion derived from the same parent molecule absorb at very similar wavelengths. There is a large hypsochromic shift in the radical anion absorption on changing from hexane to methanol solutions. The radical anions decay rapidly, in methanol, to form a species which is probably the protonated anion.
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    Radicals Derived from 1,4-Disubstituted Anthraquinones: Further Evidence for Association of Quinones in Solution
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (3), 1978) McAlpine, Eoghan; Sinclair, Roy S.; Truscott, T. George
    The radicals derived from three 1,4-disubstituted anthraquinones containing NH;, NHMc and OH substituent groups have been studied in methanol solution using the technique of pulse radiolysis. Absorption spectra and rates of formation of semiquinone radical species (DH« and Dr),formed respectively under acidic and alkaline conditions, have been recorded. Aggregation of the ground state dye must be assumed to obtain positive extinction coefficients for the radical formed under alkaline conditions