Effects of added salts on the kinetics of aquation of tris(5-nitro-1,10-phenanthroline)iron(II)

Abstract

The rate of aquation of tris(5-nitro-1,10-phenanthroline)iron(II) is increased when tetra-n-butylammonium bromide is added but decreased when potassium bromide, tetraethylammonium bromide, tetramethylammonium bromide, or caesium bromide are added. These effects are analysed in terms of salt effects on both the initial and transition states. In this analysis, use is made of the dependence of the solubility of the ligand, 5-nitro-1,10-phenanthroline, in water on added salt and of parameters which describe cation–cation interactions in mixed-salt solutions.