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Enterobactin, the most important siderophore, is the most powerful known chelater of FeIII, yet the exact structure of this complex is still not known. The structure of the vanadium(IV) analogue (depicted right), a Δ-configured trischelate complex, now allows well-founded, detailed conclusions to be drawn concerning the stereospecific formation of the iron complex and its extreme stability.
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Karpishin et al. (1992) studied this question.
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