Kinetics of oxidation of nickel(II) aza macrocycles by peroxydisulphate in aqueous media |
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| Authors: | J Lalitham and V R Vijayaraghavan |
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| Institution: | (1) Department of Physical Chemistry, University of Madras, Guindy Campus, 600 025 Chennai, India |
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| Abstract: | The kinetics of the oxidation of nickel (II) hexaaza and nickel (II) pentaaza macrocycles by the peroxydisulphate anion, S2O8
2−, were studied in aqueous media. Effect of pH on reaction rate was also studied. The rate increases with increase of S2O8
2− concentration. Rates are almost independent of acid betweenpH 4 and 2, giving overall a relatively simple second-order rate law followed by oxidation within the ion pair solvent shell.
Using rate =+1/2 dNi(L)3+]/dt =kNi(L)2+]S2O8
2−], oxidation rate constants were determined. |
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| Keywords: | Kinetics oxidation peroxydisulphate Ni(II) hexaazamacrocycle Ni(II) pentaaza macrocycle |
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