Substituted 1,10-Phenanthroline Ferrous Complex Oxidation-Reduction Indicators Potential Determinations as a Function of Acid Concentration

Formal Oxidation-Reduction Potentials and Indicator Characteristics of Some Cyanide and 2,2 -Bipyridine Complexes of Iron, Ruthenium, and Osmium.

“…Smith and Richter report formal potentials of 0.97 and 0.92 volt for [Fe(bipy)3]S04 in 1 and 4M sulfuric acid, respectively (14). These values are lower than the corresponding ones reported here, perhaps because the necessity of minimizing or correcting for the effect of dissociation was overlooked.…”

A survey of pertinent biochemical literature

“…The normal redox potential of the system Fe+++ + e^±Fe++ is given as 0.68 v in y8 M H2SO4 by Smith and Richter (1944) ; the value 0.77 is generally accepted as standard at pH 0 at 25°C (Bray and Hershey, 1934).…”

Ruthenium 2,2´-Bipyridine Complexes as Fluorescent Oxidation-Reduction Indicators.

“…These indicators should be useful therefore in the potential range where diphenylamine-sulfonic acid functions in colorless solutions, but they do not have a transition potential high enough to be used in many reactions with strong oxidizing agents such as sulfatoand perchloratocerate. Rao and co-workers suggested Rhodamine 6G as a fluorescent indicator for ;he titration of uranium(IV) with iron(III) (6) and vanadium(IV) with sulfatocerate (7).…”