What is it about?
The product of the reaction is for sure the hydroxyl radical at low pH. But FeO(2+) is possible too. Based on kinetics and thermodynamics arguments, the hydroxyl radical is formed below pH 5, and FeO(2+) above pH 5.
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Why is it important?
The question as to what the product is of the Fenton reaction has been discussed for nearly 100 years.
Perspectives
The conclusion applies to uncomplexed iron. What the product is when iron(2+) is chelated by say H4edta still needs to be established.
Professor Willem H. Koppenol
Swiss Federal Insitute of Technology (ETH)
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This page is a summary of: Ferryl for real. The Fenton reaction near neutral pH, Dalton Transactions, January 2022, Royal Society of Chemistry,
DOI: 10.1039/d2dt03168j.
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