Fast kinetic studies of dioxygen-derived species and their metal complexes. [Reactivities with ascorbate, Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid) and NADH/NADPH]

Conference · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5940991

Bielski, B H.J.

The role of metals in the reactivity of HO/sub 2//O/sub 2//sup -/ with compounds of biological interest is discussed. A scheme that illustrates the various reactions a transition metal complex can undergo when reacting with HO/sub 2//O/sub 2//sup -/ is presented in terms of ligand and pH effects. The ferrous ion catalyzed decomposition of hydrogen peroxide is reviewed in terms of new rate data for the reactions of ferric ion with perhydroxyl (HO/sub 2/) and superoxide (O/sub 2//sup -/) radicals. The new results support a mechanism proposed by Barb et al. (Barb, W.G., Baxendale, J.H., George, P. and Hargrave, K.R. 1951 - Reactions of ferrous and ferric ions with hydrogen peroxide. Part I. The ferrous ion reaction. Trans. Farad. Soc. 47, 462-500), and negates the occurrence of the Haber-Weiss reaction in this system. In presence of Mn(II)-complexes, O/sub 2//sup -/ reacts to form MnO/sub 2//sup +/-transients and Mn(III)-complexes. Their reactivities with ascorbate, Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid) and NADH/NADPH is discussed. 41 references, 1 figure, 1 table.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5940991
• Report Number(s): BNL-35992; CONF-850144-1; ON: DE85006732
• Resource Relation: Conference: Meeting of inorganic and organic radicals: their biological and clinical relevance, London, UK, 30 Jan 1985
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
HYDROGEN PEROXIDE
DECOMPOSITION
HYDROPEROXY RADICALS
CHEMICAL REACTIONS
IRON COMPOUNDS
CATALYTIC EFFECTS
MANGANESE COMPLEXES
SUPEROXIDE RADICALS
CATIONS
CHARGED PARTICLES
COMPLEXES
HYDROGEN COMPOUNDS
IONS
OXYGEN COMPOUNDS
PEROXIDES
RADICALS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
400600 - Radiation Chemistry