Elucidation of the mechanisms of peroxyl radical reactions in aqueous solutions using the pulse radiolysis technique

1986 ◽  
Vol 101 (2) ◽  
pp. 199-207 ◽  
Author(s):  
H. Zegota ◽  
M. N. Schuchmann ◽  
C. Von Sonntag
Keyword(s):  
Aqueous Solutions ◽  
Pulse Radiolysis ◽  
Peroxyl Radical ◽  
Radical Reactions

Acetate Peroxyl Radicals, ·O2CH2 CO2-: A Study on the γ-Radiolysis and Pulse Radiolysis of Acetate in Oxygenated Aqueous Solutions

1985 ◽  
Vol 40 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Man Nien Schuchmann ◽  
Henryk Zegota ◽  
Clemens von Sonntag
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Pulse Radiolysis ◽  
Glycolic Acid ◽  
Peroxyl Radical ◽  
Radical Reaction ◽  
Glyoxylic Acid ◽  
Peroxyl Radicals ◽  
Oxygen Addition

Abstract Hydroxyl radicals from the radiolysis of N2O/O2 (4:1 v/v)-saturated aqueous solutions have been reacted with acetate ions (10-2M). As measured by pulse radiolysis, the resulting ·CH2CO2- radicals react with oxygen yielding the corresponding peroxyl radicals, ·O2CH2CO2- (k = 1.7 x 109 M-1s-1).These peroxyl radicals decay bimolecularly (2k = 1.5 x 108 M-1s-1) giving rise to the products (G values in brackets) glyoxylic acid (2.7), glycolic acid (0.7), formaldehyde (1.4), carbon dioxide (1.4), organic hydroperoxide (0.7) and hydrogen peroxide (2.5). Oxygen is consumed with a G value of 5.3. Aided by data from pulse radiolysis it is concluded that the intermediate tetroxide formed upon the bimolecular decay breaks down by various routes to yield:(i) hydrogen peroxide and two molecules of glyoxylic acid (ca. 27%);(ii) oxygen, glycolic acid and glyoxylic acid (ca. 25%);(iii) hydrogen peroxide and two molecules of formaldehyde, carbon dioxide and OH- (25%).These reactions do not involve free radicals as intermediates;(iv) There is some O⨪2 (G ≈ 0.5) formed in the decay of the peroxyl radicals, which is attributed to the decay of intermediate oxyl radicals (tetroxide → O2 + 2 ·OCH2CO2-) by 1,2-H shift, oxygen addition and HO2· elimination, a reaction sequence which gives rise to glyoxylic acid (10%); (v)The reaction of O2⨪ with the organic peroxyl radical yields the hydroperoxide (13%).Reaction (iii) is a novel peroxyl radical reaction.

Superoxide Radical Reactions in Aqueous Solutions of Pyrogallol and N-propyl Gallate: The Involvement of Phenoxyl Radicals. A Pulse Radiolysis Study

1988 ◽  
Vol 54 (2) ◽  
pp. 179-193 ◽  
Author(s):  
David J. Deeble ◽  
Barry J. Parsons ◽  
Glyn O. Phillips ◽  
Heinz-Peter Schuchmann ◽  
Clemens Von Sonntag
Keyword(s):  
Aqueous Solutions ◽  
Propyl Gallate ◽  
Pulse Radiolysis ◽  
Superoxide Radical ◽  
Radical Reactions ◽  
Phenoxyl Radicals

Pulse radiolysis study of dithio-oxamide in aqueous solutions

2000 ◽  
Vol 26 (4) ◽  
pp. 309-318 ◽  
Author(s):  
G. R. Dey ◽  
D. B. Naik ◽  
P. Dwibedy ◽  
K. Kishore
Keyword(s):  
Aqueous Solutions ◽  
Pulse Radiolysis

ChemInform Abstract: PULSE RADIOLYSIS OF MERCURY(II) CYANIDE IN AQUEOUS SOLUTIONS

1976 ◽  
Vol 7 (7) ◽  
pp. no-no
Author(s):  
SHIN-ICHI FUJITA ◽  
HIDEO HORII ◽  
TOSHIAKI MORI ◽  
SETZUO TANIGUCHI
Keyword(s):  
Aqueous Solutions ◽  
Pulse Radiolysis
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