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'Pulse Radiolysis' in keywords Facet   Publication Year 1984  [X]
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1Author    Alicja Piesiak, M. An, Nien Schuchmann, Henryk Zegota, Clemens Von SonntagRequires cookie*
 Title    ß-Hydroxyethylperoxyl Radicals: A Study of the y-Radiolysis and Pulse Radiolysis of Ethylene in Oxygenated Aqueous Solutions  
 Abstract    Hydroxyl radicals (and H atom s) generated in the radiolysis of N20-co n tain in g w ater add to ethylene forming /3-hydroxyethyl radicals (and ethyl radicals). In the presence of oxygen these are converted into the corresponding peroxyl radicals which decay bim olecularly (2 k — 2 x 108 M ~'s-1) as m easured by pulse radiolysis. The m ajor products (G values in brackets) are glycolaldehyde (3.3), form aldehyde (1.6), ethylene glycol (0.8), acetaldehyde (0.5), organic peroxidic m aterial (0.5), and hydrogen peroxide (2.4) (dose rate 0.26 Gy s-1, pH 5.6). A m aterial balance has been obtained with respect to the primary w ater radicals (6.0) and oxygen uptake (4.8). The products and their yields can be accounted for if in the rate determ ining step atetro x id e is form ed which decomposes via three m ajor pathways leading to; (i) H 20 2 and two m olecules of glycolaldehyde (ca. 45%), (ii) 0 2, glycolaldehyde and ethylene glycol (ca. 30%), and (iii) 0 2, two molecules of form aldehyde and two C H 2OH radicals (ca. 15%). A 1,2-H shift of interm ediate oxyl radicals is unim portant in this system. 
  Reference    Z. Naturforsch. 39b, 1262—1267 (1984); received March 5 1984 
  Published    1984 
  Keywords    Peroxyl Radicals, Oxyl Radicals, Pulse Radiolysis, Ethylene, Reaction Kinetics 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-1262.pdf 
 Identifier    ZNB-1984-39b-1262 
 Volume    39