Polarographic and optical pulse radiolysis study of the radicals formed by hydroxyl radical attack on imidazole and related compounds in aqueous solutions

1975 ◽  
Vol 79 (17) ◽  
pp. 1775-1780 ◽  
Author(s):  
K. M. Bansal ◽  
R. M. Sellers
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Pulse Radiolysis ◽  
Optical Pulse ◽  
Radical Attack ◽  
Related Compounds

Conductometric Pulse Radiolysis Study on the Reaction of the Solvated Electron with 5-Bromouracil in Aqueous Solutions at Different pH Values

1974 ◽  
Vol 29 (1-2) ◽  
pp. 86-88b ◽  
Author(s):  
Burkhard O. Wagner ◽  
Herbert Klever ◽  
Dietrich Schulte-Frohlinde
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Atom ◽  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Rate Constant ◽  
Pulse Radiolysis ◽  
Solvated Electron ◽  
Ph Values

To study the reaction of the solvated electron with 5-bromouracil an aqueous solution has been examined by conductometric pulse radiolysis at pH values between 4.68 and 8.74. Alcohol was added to scavenge the hydrogen atom and the hydroxyl radical. G(Br—) = (2.64 ± 0.08)/100 eV was found to be independent of the pH. The mobility of the bromouracil mono-anion was measured to be (2.7 ± 0.2) 10-4 cm2 V-1 s-1 at 20°C, and the rate constant of reaction (3b) was determined to be k(H+ BrUr-) = (2.3 ± 0.2) 1010 I mole-1 s-1*.

Pulse radiolysis of aqueous solutions of N-Vinylpyrrolidin-2-one and Poly(N-vinylpyrrolidin-2-one)

1981 ◽  
Vol 34 (7) ◽  
pp. 1423 ◽  
Author(s):  
JE Davis ◽  
DF Sangster ◽  
E Senogles
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Absorption Spectra ◽  
Rate Constant ◽  
Rate Constants ◽  
Pulse Radiolysis ◽  
Kinetic Method ◽  
Transient Species ◽  
Radical Scavengers ◽  
Dilute Aqueous Solutions

The absorption spectra of transient species produced when dilute aqueous solutions of N-vinylpyrrolidin-2-one (vp) and poly(N- vinylpyrrolidin-2-one) (pvp) are subjected to pulse radiolysis in the presence and absence of radical scavengers have been obtained and compared with those obtained from analogous compounds. The precise structure of the transients has not been established. Rate constants for the reaction of the hydroxyl radical with vp and pvp have been evaluated both by a competition kinetic method and by direct observation of the build-up of transient species: k(vp+·OH) = (6.4-8.1) × 109 dm3 mol-1 s-1 and k(pvp+·OH) = (1.5-2.3) × 108 dm3 mol-1 s-1 at 25°C. The rate constant for the reaction of the hydrated electron with vp has been determined as(1.6�0.3) × 109 dm3 mol-1 s-1 at 25°C. Rate constants for decay of the transient species have also been evaluated at 25°C: 2k(vp- OH·) = (8.1�1.0)× 108 dm3 mol-1 s-1; 2k(vp-e-) = (1.7�0.2) × 109 dm3 mol-1 s-1 and 2k(pvp-OH·) = (1.5�0.2) × 108 dm3 mol-1 s-1.

Steady State Radiolysis of Aqueous Aerated Solutions of 5,6-Dihydrothymine. Identification of the Major Degradation Products

1980 ◽  
Vol 35 (12) ◽  
pp. 1579-1583 ◽  
Author(s):  
J. Cadet
Keyword(s):  
Steady State ◽  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Degradation Products ◽  
Ethylenic Bond ◽  
Decomposition Products ◽  
Radiation Induced ◽  
Radical Attack

Abstract The major radiation-induced degradation products of 5,6-dihydrothymine (1) in aqueous solutions saturated either with O2 or N2O/O2 (75/25 v/v) were identified as thymine (10), the trans-and cis-isomers of 6-hydroperoxy-5,6-dihydrothymine (5, 7), 5-hydroperoxy-5,6-dihydrothymine (9), and their corresponding hydroxy derivatives (4, 6, 8). The formation of these compounds is explained in terms of initial H-abstraction from the C(5) and C(6) carbons which gives rise respectively to the transient 5-yl and 6-yl radicals. Thymine hydroxy-hydroperoxides (11-14) and their decomposition products (17-20), which are derived from hydroxyl radical attack at the 5,6-ethylenic bond of thymine (10), were also characterized.

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

Hydroxyl radical rate constants: comparing UV/H2O2 and pulse radiolysis for environmental pollutants

2008 ◽  
Vol 57 (6) ◽  
pp. 391-401 ◽  
Author(s):  
Michael S. Elovitz ◽  
Hilla Shemer ◽  
Julie R. Peller ◽  
K. Vinodgopal ◽  
Mano Sivaganesan ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Rate Constants ◽  
Pulse Radiolysis ◽  
Environmental Pollutants
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