Abstract
The kinetics of oxidation of Ni11[meso-Me6[14]aneN4] (NiL2+) to Ni(III) by OH radical and subsequent complexation by sulfate ion have been studied in acidic aqueous media at 22°C and μ=0.01-0.3 M by the pulse radiolytic technique. Results indicate that NiL3+hydrolyzes with a pK+3.7±0.2 but that, at least up to pH 5.2, substitution by SO42- occurs only on the unhydrolyzed species with a rate constant of 1X106 M-1 s-1 at μ=0.03 M. The equilibrium constant for sulfate complexation is 3.0X104 M-1 at μ=0.03 M and the product of the reaction is identical with the stable NiLSO4+species produced by the electrochemical oxidation of NiL2+in sulfate media. The results demonstrate the stabilization of NiIII by sulfate complexation.
Original language | English |
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Pages (from-to) | 2763-2766 |
Number of pages | 4 |
Journal | Inorganic Chemistry |
Volume | 18 |
Issue number | 10 |
DOIs | |
State | Published - 1979 |
Externally published | Yes |