The effect of triethanolamine on the iron(III)-catalyzed decomposition of hydrogen peroxide
The influence of triethanolamine on the iron(III)-catalyzed decomposition of hydrogen peroxide was studied by manometric and spectrophotometric techniques. This ligand caused increasing inhibition with increasing concentration, attributed to the saturation of the coordination sphere of the metal, and also to its properties as a radical scavenger. Kinetic measurements indicated the formation and the subsequent breakdown of a peroxo-intermediate in the rate-determining step, for which a rate constant of 2.9 {times} 10{sup {minus}2} s{sup {minus}1} was determined at 308 K. Evidence for the participation of oxygen radicals, as well as carbon-centered radicals, was obtained from ESR spectra of the radial adducts detected using the spintrap method. Based on the pH profile for the reaction, a mechanism was proposed, suggesting the formation of different complexes with different catalytic activities, at higher pH.
- OSTI ID:
- 6998697
- Journal Information:
- Journal of Coordination Chemistry; (United States), Journal Name: Journal of Coordination Chemistry; (United States) Vol. 24:4; ISSN JCCMB; ISSN 0095-8972
- Country of Publication:
- United States
- Language:
- English
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400201* -- Chemical & Physicochemical Properties
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59 BASIC BIOLOGICAL SCIENCES
ALKYL RADICALS
AMINES
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
HOMOGENEOUS CATALYSIS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
IRON COMPOUNDS
KINETICS
LIGANDS
MAGNETIC RESONANCE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
PEROXIDES
PH VALUE
RADICALS
REACTION KINETICS
RESONANCE
TRANSITION ELEMENT COMPOUNDS