Electrochemical and esr spin trap studies of a new iron tetra-catecholamide complex.
A new siderophore, N5,N6-thiodipropanoyl-bis[N1,N10-bis(2,3-dihydroxy benzoyl-spermidine)]-Fe (III) complex or H2LFe has been synthesised. The reaction of the reduced form of this complex with dioxygen has been investigated through electrochemical study and revealed the formation of a new species assumed to be H2O2. This species has been confirmed by esr spectroscopy using the diamagnetic compound 5-deutero-2,2,5-trimethylpyrrolidine-1-hydroxyl as spin trap. The resulting persistent radical is 5-deutero-2,2,5-trimethylpyrrolidine-1-yloxy (aN = 16.58 G, aD = 3.49 G).
Cheraïti
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Laboratoire de Chimie de Coordination Bioorganique et Bioinorganique, ICMO URA, Université de Paris-Sud, Orsay, France.
Brik
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ME
Keita
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B
Nadjo
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L
Gaudemer
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A
D002395:Catecholamines / Q000737:chemistry*; D004563:Electrochemistry; D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds / Q000737:chemistry*; D007502:Iron Chelating Agents / Q000737:chemistry*; D013113:Spin Labels
D002395:Catecholamines; D005290:Ferric Compounds; D007502:Iron Chelating Agents; C121654:N5,N6-thiodipropanoylbis(N1,N10--bis(2,3-dihydroxybenzoylspermidine))iron(III); D013113:Spin Labels