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The reduction potentials for two Wurster’s crowns, aza crown ethers which incorporate the redox active N,N,N′,N′-tetraalkyl-1,4-phenylenediamine into the structure of 18-crown-6, were studied in the presence of the siderophore ferrioxamine B, FeHDFB + . Addition of FeHDFB + resulted in a positive shift in the host reduction potential for both aza crown ethers studied. This shift is...
While the naturally occurring reducing agents glutathione (GSH) and ascorbate (H2A) alone are ineffective at reducing iron(III) sequestered by the siderophore ferrioxamine B, the addition of an iron(II) chelator, sulfonated bathophenanthroline (BPDS), facilitates reduction by either reducing agent. A mechanism is described in which a ternary complex is formed between ferrioxamine B and BPDS in a rapidly...
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