Kinetic and equilibrium studies on iron(II) and iron(III) pentacyanoferrates
Abstract
The results of a kinetic investigation of the reaction of [FeII(CN)5(py)]3–(py = pyridine) with CN– and HCN are reported, together with a linear free-energy treatment of data obtained for aquation reactions of species of the type [FeII(CN)5X](X = an uncharged or univalent anion). Equilibrium studies of [FeII(CN)5OH2]3– and [FeIII(CN)5OH2]2– with a number of substituents have confirmed the class (b) or ‘soft’ character of the iron centre in these complexes.