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

Research output: Contribution to journal › Article › peer-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^-, 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

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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.",

author = "Avraham Meshulam and Haim Cohen and Dan Meyerstein",

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

year = "1990",

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doi = "10.1016/S0020-1693(00)85094-X",

language = "אנגלית",

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T1 - 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

AU - Meshulam, Avraham

AU - Cohen, Haim

AU - Meyerstein, Dan

N1 - Funding Information: This study was supported by a grant from The Planning and Granting Committee and the Israel Atomic Energy Committee.

PY - 1990/10/1

Y1 - 1990/10/1

N2 - 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.

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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JO - Inorganica Chimica Acta

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ER -

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

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