Abstract
PYRIDINE 2-ALDOXIME forms well-defined coloured complexes with ferrous and with ferric ions in aqueous solution. The ferrous complex is violet-red in alkaline solution (with an absorption maximum at 530 mμ), reddish-orange in slightly acidic solution (with a maximum at 515 mμ), and golden-yellow below pH. 3 (with a maximum at 475 mμ). The ferric complex is reddish-brown in alkaline, neutral and slightly acidic solution (with no absorption maxima in the visible), and yellow in more acidic solution. All the colour changes are reversible.
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