Kinetics of oxidation of nickel(II) aza macrocycles by peroxydisulphate in aqueous media

[摘要] 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 S2OO8 2- concentration. Rates are almost independent of acid between 𝑝H 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 d[Ni(L)3+]/dt = k[Ni(L)2+][S2O8 2-], oxidation rate constants were determined.

[关键词] Kinetics;oxidation;peroxydisulphate;Ni(II) hexaazamacrocycle;Ni(II) pentaaza macrocycle.