Published May 27, 1992 | Version v1
Journal article Metadata-only

Mechanism of oxidation of (meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane)nickel(II) by HO2 free radicals in aqueous solutions. A pulse radiolysis study

Creators

  • 1. Ben Gurion Univ. of the Negev, Beer Sheva (Israel)
  • 2. Univ. of Witten/Herdecke (Germany)

Description

The title complex NiL2+ is oxidized in aqueous solutions in the pH range 3-7 in the presence of stabilizing anions X, X = HCO2-, SO42-, and H2PO4-, by HO2 sm-bullet free radicals to NiIIILX2. The dependence of the rate of formation on [NiL2+] and X indicates that the HO2 sm-bullet radical reacts with a [NiL2+] complex in the ion pair [NiL2+,X], forming the final products. The volumes of activation of the oxidation processes were measured; an analysis of the data indicates that the ion pairs involved are contact ion pairs. The results indicate that in the presence of appropriate transition-metal complexes the superoxide free radical is a potent oxidizing agent and suggest that this might cause some of the aspects of its toxicity

Additional details

Publishing Information

Journal Title
Inorganic Chemistry
Journal Volume
31
Journal Issue
11
Journal Page Range
p. 2151-2156.
ISSN
0020-1669
CODEN
INOCAJ

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
24021836
Subject category
S38: RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY;
Descriptors DEI
AQUEOUS SOLUTIONS; CHEMICAL REACTION KINETICS; LIGANDS; NICKEL COMPLEXES; OXIDATION; PEROXY RADICALS; PH VALUE; RADIOLYSIS; TIME DEPENDENCE; TOXICITY
Descriptors DEC
CHEMICAL RADIATION EFFECTS; CHEMICAL REACTIONS; COMPLEXES; DECOMPOSITION; DISPERSIONS; HOMOGENEOUS MIXTURES; KINETICS; MIXTURES; RADIATION EFFECTS; RADICALS; REACTION KINETICS; SOLUTIONS; TRANSITION ELEMENT COMPLEXES