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O2 reduction by the hydroquinone-quinone couples in the presence of iron. (A) With hydroquinone and Fe3+. The curves show O2 uptake with 2,5-DMHQ plus Fe3+ (a), with 4,5-DMC plus Fe3+ (b), with 2,5-DMHQ minus Fe3+ (c), with 4,5-DMC minus Fe3+ (d), and with Fe3+ minus hydroquinone (e). (B) With quinone and Fe2+. The curves show O2 uptake with 2,5-DMBQ plus Fe2+ (a), with 4,5-DMBQ plus Fe2+ (b), with Fe2+ minus quinone (c), and with oxalate buffer alone (d).
