Kinetics of reactions of Schiff-base complexes of iron(II). Part III. Reactions of tris-[N-(2-pyridylmethylene)aniline] complexes with peroxodisulphate and of tris-[α-(2-pyridyl)benzylideneaniline] complexes with acid, with hydroxide, and with peroxodisulphate

Abstract

The kinetics of reactions of several substituted tris-[N-(2-pyridylmethylene)aniline]iron(II) complexes with peroxodisulphate in aqueous solution; of tris-[α-(2-pyridyl)benzylideneaniline]iron(II) complexes with acid, hydroxide, and peroxodisulphate in aqueous ethanolic solution; and of bis(maleonitriledithiolato)cobaltate(II) with acid and with peroxodisulphate in aqueous solution are reported. The kinetic behaviour of the tris-[α-(2-pyridyl)-benzylideneaniline]iron(II) complexes in acid and alkaline solution is similar to that of the related tris-(1,10-phenanthroline)iron(II) complex. Reaction of peroxodisulphate with tris-[N-(2-pyridylmethylene)aniline]-iron(II) complexes takes place by parallel ligand dissociation and complex oxidation, whereas reaction of the tris-[α-(2-pyridyl)benzylideneaniline]iron(II) and bis(maleonitriledithiolato)cobaltate(II) complexes is entirely dissociative with no evidence for any direct oxidation of these complexes to the corresponding iron(III) and cobalt(III) compounds.