5,7,7,12,14,14-Hexamethyl-1,4,8,11-tetraazacyclotetradecane-nickel(II) as a catalyst for oxidations by superoxide in aqueous solutions. A pulse radiolysis study

Avraham Meshulam, Haim Cohen, Dan Meyerstein

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The title complex, NiL2+ is oxidized in aqueous solutions in the pH range 3-7 in the presence of stabilizing anions X (XHCO2-, SO42- and PO43-), by HO2· free radicals to Ni(III)LX2. The latter complexes are powerful oxidizing agents which oxidize HCO2-, S2O32-, NO2- and ascorbate. Thus the title complex acts as a catalyst for oxidations by the superoxide free radical which is in equilibrium with the HO2· free radical. The results point out 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.

Original languageEnglish
Pages (from-to)75-77
Number of pages3
JournalInorganica Chimica Acta
Volume176
Issue number1
DOIs
StatePublished - 1 Oct 1990
Externally publishedYes

Bibliographical note

Funding Information:
This study was supported by a grant from The Planning and Granting Committee and the Israel Atomic Energy Committee.

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