Effect of pH on the conditional reduction potential of the tris(1,10-phenanthroline)iron(III,II) couple.

The half-wave potential for reduction of tris(1,10-phenanthroline)iron(II) at a rotated platinum electrode is constant from pH 0 to 11. The value is 1.06 V at 25.0 degrees and ionic strength 1.0 and is equal to the conditional reduction potential of the tris(1,10-phenanthroline)iron(III,II) couple, as demonstrated by cyclic voltammetry.