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Three new iron complexes Na2(Fe(5-SO3-salpn)(H2O)2)OH⋅4H2O (1⋅4H2O), Na2(Fe(5-SO3- salpnOH)(H2O)2)Cl⋅7H2O (2⋅7H2O) and Na2(Fe2(5-SO3-salpentO)(µ-OAc)(µ- (OH)(H2O)2)OH⋅3H2O (3⋅3H2O), where 5-SO3-salpn = 1,3-bis(5-SO3-salicylidenamino)propane, 5-SO3-salpnOH = 1,3-bis(5-SO3-salicylidenamino)propan-2-ol and 5-SO3-sapentOH = 1,5-bis(5- SO3-salicylidenamino)pentan-3-ol, have been obtained and characterized. The ligands tune the redox potential of 1 and 2 within the range required for superoxide dismutase activity, with 2 being less reactive as a result of the formation of an inactive dimer. Complex 3 looses acetate and converts into a µ-oxo-Fe2 species responsible for its catalase activity. The more negative reduction potentials of 1 - 3 and their lower stability result in rates of superoxide and peroxide disproportionation 10- to 100-times slower than those of the Mn counterparts.

Properties and antioxidant activity of water-soluble iron catalysts with Schiff base ligands. Comparison with their manganese counterparts