TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=4243960695&partnerID=8YFLogxK
U2 - 10.1016/S0020-1693(00)85094-X
DO - 10.1016/S0020-1693(00)85094-X
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AN - SCOPUS:4243960695
SN - 0020-1693
VL - 176
SP - 75
EP - 77
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 1
ER -