There are some papers talking about that scopoletin helps the uptake of iron. There is no adjacent hydroxyl groups in scopoletin, but a hydroxyl and a methoxy group. I suspect that methoxy group may also act as a chelator, but there is no evidence supporting this argument.
Mushtaq Ahmad
The essential role of coumarin secretion for Fe acquisition from alkaline soil
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4883844/
may be useful
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Yuri Mirgorod
Dear Shi Liu:
Scopoletin can be used for the extraction of iron ions. He has a ketone, methoxy group. Ethers and ketones used for this purpose. H.Specker, W.Doll. Z. Anal. Chem.. 152. 178. 1956 .
Best regards.
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