Properties and antioxidant activity of water-soluble iron catalysts with Schiff base ligands. Comparison with their manganese counterparts
Three new iron complexes Na 2 [Fe(5-SO 3 -salpn)(H 2 O) 2 ]OH•4H 2 O (1•4H 2 O), Na 2 [Fe(5-SO 3 -salpnOH)(H 2 O) 2 ]Cl•7H 2 O (2•7H 2 O) and Na 2 [Fe 2 (5-SO 3 -salpentO)(μ-OAc)(μ-(OH)(H 2 O) 2 ]OH•3H 2 O (3•3H 2 O), where 5-SO 3 -salpn = 1,3-bis(5-SO 3 -salicylidenamino)propane, 5-SO 3 -salpnOH =...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1551-701_v2011_n7_p327_Daier http://hdl.handle.net/20.500.12110/paper_1551-701_v2011_n7_p327_Daier |
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| Sumario: | Three new iron complexes Na 2 [Fe(5-SO 3 -salpn)(H 2 O) 2 ]OH•4H 2 O (1•4H 2 O), Na 2 [Fe(5-SO 3 -salpnOH)(H 2 O) 2 ]Cl•7H 2 O (2•7H 2 O) and Na 2 [Fe 2 (5-SO 3 -salpentO)(μ-OAc)(μ-(OH)(H 2 O) 2 ]OH•3H 2 O (3•3H 2 O), where 5-SO 3 -salpn = 1,3-bis(5-SO 3 -salicylidenamino)propane, 5-SO 3 -salpnOH = 1,3-bis(5-SO 3 -salicylidenamino)propan-2-ol and 5-SO 3 -sapentOH = 1,5-bis(5-SO 3 -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. © ARKAT-USA, Inc. |
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