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
Citations
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Reactions of reactive oxygen species (ROS) with curcumin analogues: Structure–activity relationship
TL;DR: It is suggested that both phenolic OH and the β-diketone moiety of curcumin are involved in neutralizing the free radicals and their relative scavenging ability depends on the nature of thefree radicals.
Journal ArticleDOI
Oxidation Reactions of 1- and 2-Naphthols: An Experimental and Theoretical Study
Radhakrishnan Sreekanth,K. P. Prasanthkumar,M. M. Sunil Paul,Usha K. Aravind,Charuvila T. Aravindakumar +4 more
TL;DR: It is postulated that dihydroxy naphthalenes are derived explicitly from the most favorable (•)OH-adducts speculated by using theoretical calculations which in turn substantiate the proposed reaction mechanisms.
Journal ArticleDOI
Size tunable synthesis of silver nanoparticles in water–ethylene glycol mixtures
TL;DR: In this article, the formation of Ag nanoparticles was monitored using UV-vis absorption spectroscopy, and it was observed that adsorption of ethylene glycol at the surface of dimmer silver cluster leads to the formation a ligand-to-metal charge transfer (LMCT) band at around 390nm.
Journal ArticleDOI
Reactions of e(-)(aq), CO(2)(*)(-), HO(*), O(2)(*)(-) and O(2)((1)delta(g)) with a dendro[60]fullerene and C(60)[C(COOH)(2)](n) (n = 2-6).
René V. Bensasson,Michael Brettreich,J Frederiksen,H Gottinger,Andreas Hirsch,Edward J. Land,Sydney Leach,David J. McGarvey,Hubert Schönberger +8 more
TL;DR: Using pulse radiolysis and laser flash photolysis, the authors in this article investigated the reactions of the deleterious species, e(-)(aq), HOz, O(2)(*)(-) and O( 2)((1)Delta(g)) with 10 water-soluble cyclopropyl-fused C(60) derivatives including a mono-adduct dendro[60]fullerene (d) and C( 60) derivatives based on C(COOH)(2)](n=2-6), some of
Journal ArticleDOI
Kinetics of the reaction between nitroxide and thiyl radicals: nitroxides as antioxidants in the presence of thiols.
TL;DR: Under physiological conditions the adduct is mainly deprotonated, and therefore nitroxides can detoxify thiyl radicals, and the proposed mechanism can account for the protective effect of nitroxide against reactive oxygen- and nitrogen-derived species in the presence of thiols.
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
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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.