Stable solutions of NiIII complexes of the 14membered macrocyclic ligands (I), (11), and (111) were obtained by electrochemical oxidation on gold and platinum electrodes of the corresponding Nix1 complexes in mild acidic aqueous solutions in the presence of sulphate; the NiIII complexes formed represent a new kind of strong, easily accessible, single-electron , oxidizing agent with E" ca. 1 V vs. standard hydrogen electrode (S.H.E.) in aqueous media.
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