Kinetics of formation and bridge cleavage of binuclear complexes derived from the pentacyanoferrate(II and III) ions in aqueous solution

Abstract

Kinetic data for the reaction of [Fe^II(CN)₅(OH₂)]^3–with [Fe^II(CN)₆]^4– and [Co^III(CN)₆]^3– to give [Fe^II₂(CN)₁₁]^7– and [Fe^IICo^III(CN)₁₁]^6– respectively, and the bridge-cleavage reactions of the binuclear complexes, show that these reactions are predominantly dissociative. The bridge-cleavage reaction of [Fe^IIICo^III(CN)₁₁]^5– is much slower than the corresponding reaction of [Fe^IICo^III(CN)₁₁]^6– and the rate of the former complex is accelerated by the addition of [Fe^II(CN)₅(OH₂)]^3–.