Journal ArticleDOI
Re-evaluation of the thiocyanate dosimeter for pulse radiolysis
George V. Buxton,Craig R. Stuart +1 more
TLDR
In this article, the super-Fricke dosimeter was used as a secondary standard for the thiocyanate dosimeter in O2-saturated water and the results were improved to 3.47 ± 0.06.Abstract:
The thiocyanate dosimeter (10–2 mol dm–3 SCN– in O2-saturated water) has been standardised against the super-Fricke dosimeter (10–2 mol dm–3 FeII in O2-saturated 0.4 mol dm–3 H2SO4) using the hexacyanoferrate(II) dosimeter [5 × 10–3 mol dm–3 Fe(CN)64– in O2-saturated water] as a secondary standard. On the basis that G(FeIII)= 1.67 × 10–6 mol J–1 and IµFeIII= 220.4 m2 mol–1 at 304 nm and 25 °C in the super-Fricke dosimeter, we obtain GIµ[Fe(CN)63–]=(3.47 ± 0.06)× 10–5 m2 J–1 at 420 nm and GIµ(SCN)2˙–=(2.59 ± 0.05)× 10–4 m2 J–1 at 475 nm. These values remain unchanged when the solutions are saturated with air instead of O2 and are doubled in N2O-saturated solution.read more
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Fenton Chemistry of 1,3-Dimethyluracil
Jacob A. Theruvathu,Charuvila T. Aravindakumar,Roman Flyunt,and Justus von Sonntag,Clemens von Sonntag +4 more
TL;DR: Hydroxyl radicals were generated in the Fenton reaction at pH 4 by pulseRadiolysis and by pulse radiolysis by determining the yield of reducing radicals with tetranitromethane by following the buildup of nitroform anion.
Journal ArticleDOI
Evaluation of free radical scavenging activity of morel mushroom, Morchella esculenta mycelia: A potential source of therapeutically useful antioxidants
TL;DR: The investigation showed that the morel mushroom mycelium is an excellent source of antioxidants which are capable of imparting protection at different levels, and suggest the potential therapeutic use of M. esculenta mycelia as an efficient antioxidant.
Journal ArticleDOI
Rate Constant Determination for the Reaction of Hydroxyl and Glutathione Thiyl Radicals with Glutathione in Aqueous Solution
TL;DR: In this paper, the rate constants for disulfide radical anion dissociation were derived from computer modeling of established mechanisms of the observed growths, and pH-dependent rate constants were obtained for the reaction of hydroxyl radicals with glutathione to produce the thiyl radical.
Journal ArticleDOI
Electronic structure and optical properties of charged oligofluorenes studied by VIS/NIR spectroscopy and time-dependent density functional theory.
Silvia Fratiloiu,Ferdinand C. Grozema,Yoshiko Koizumi,Shu Seki,Akinori Saeki,Seiichi Tagawa,Stephen P. Dudek,Laurens D. A. Siebbeles +7 more
TL;DR: The potential energy profiles for rotation around the inter-unit bond show that oligofluorenes are nonplanar in their neutral state, while they tend to more planar structures in their charged state, which suggests that the charge delocalizes along the oligomer chain.
Journal ArticleDOI
Reactions of Hydroxyl Radical with Dimethyl Methylphosphonate and Diethyl Methylphosphonate. A Fundamental Mechanistic Study
TL;DR: Dimethyl methylphosphonate (DMMP) and diethyl methyl phosphonate(DEMP) were used as models for hazardous organophosphorus compounds to study their radiolytic reactions as mentioned in this paper.
References
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Journal ArticleDOI
Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
TL;DR: In this article, the rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes, and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods.
Journal Article
Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
Journal ArticleDOI
Yield for the scavenging of hydroxyl radicals in the radiolysis of nitrous oxide-saturated aqueous solutions
TL;DR: In this article, the thiocyanate dosimeter was calibrated against the Fricke system to obtain a value of 46,400 +-600 (molecules/100 eV) for the product of yield and extinction coefficient of (SCN)/sub 2/O-saturated solutions.
Journal ArticleDOI
Track effects in radiation chemistry. Concentration dependence for the scavenging of hydroxyl by ferrocyanide in nitrous oxide-saturated aqueous solutions
TL;DR: In this paper, the radiation chemical yield for oxidation of ferrocyanide by OH produced in the fast electron radiolysis of N/sub 2/O-saturated aqueous solutions was found to increase from a low concentration limiting yield of 5.2 to values in excess of 6.7.