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

doi:10.1016/s0020-1693(00)85094-x

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

Ben-Gurion University of the Negev

Research output: Contribution to journal › Article › peer-review

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Abstract

The title complex, NiL²⁺ is oxidized in aqueous solutions in the pH range 3-7 in the presence of stabilizing anions X (XHCO₂^-, SO₄^2- and PO₄^3-), by HO₂^· free radicals to Ni(III)LX₂. The latter complexes are powerful oxidizing agents which oxidize HCO₂^-, S₂O₃^2-, 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 language	English
Pages (from-to)	75-77
Number of pages	3
Journal	Inorganica Chimica Acta
Volume	176
Issue number	1
DOIs	https://doi.org/10.1016/s0020-1693(00)85094-x
State	Published - 1 Oct 1990
Externally published	Yes

Bibliographical note

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

Funding

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

Funders	Funder number
Israel Atomic Energy Committee

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10.1016/s0020-1693(00)85094-x

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title = "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",

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.",

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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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AU - Meshulam, Avraham

AU - Cohen, Haim

AU - Meyerstein, Dan

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AB - 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.

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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

Abstract

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