Reaction of Ferrous and Ferric Iron with 1,10-Phenanthroline. I. Dissociation Constants of Ferrous and Ferric Phenanthroline

Abstract

1,10-Phenanthroline has been found to behave as a typical mono-acid base in aqueous solutions. The acid dissociation constant of the phenanthrolium ion is 1.1 × 10-5at 25°. The dissociation constants of ferrous and ferric phenanthroline have been evaluated. The constant of ferrous phenanthroline in various concentrations of sulfuric acid is 5 × 10-22at 25°, and that of ferric phenanthroline in 0.05 Msulfuric acid is 8 × 10-15at 25°. © 1948, American Chemical Society. All rights reserved.