Gallic Acid, Ellagic Acid and Pyrogallol Reaction with Metallic Iron

The reaction between gallic acid, ellagic acid and pyrogallol with metallic iron was studied using infrared and Mössbauer spectroscopy. Most hydrolysable tannins with interesting anticorrosive or inhibition properties are structurally related to these compounds, thus they may be used as models for t...

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Bibliographic Details
Published in:Hyperfine interactions 2003, Vol.148/149 (1-4), p.227-235
Main Authors: Jaén, J. A., González, L., Vargas, A., Olave, G.
Format: Article
Language:English
Subjects:
Acids
Corrosion prevention
Gallic acid
Iron
Mossbauer spectroscopy
Polyphenols
Tannins
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Summary:The reaction between gallic acid, ellagic acid and pyrogallol with metallic iron was studied using infrared and Mössbauer spectroscopy. Most hydrolysable tannins with interesting anticorrosive or inhibition properties are structurally related to these compounds, thus they may be used as models for the study of hydrolysable tannins and related polyphenols. The interaction was followed up to 3 months. Results indicated two different behaviors. At polyphenol concentrations higher than 1% iron converts to sparingly soluble and amorphous ferric (and ferrous) polyphenolate complexes. At lower concentrations (0.1%), the hydrolysis reactions are dominant, resulting in the formation of oxyhydroxides, which can be further reduced to compounds like magnetite by the polyphenols.
ISSN:0304-3843
1572-9540
DOI:10.1023/B:HYPE.0000003784.88539.d4