Notes. Electron-transfer processes and electrodeposition involving the iron hexacyanoferrates studied voltammetrically

Abstract

Iron(III) hexacyanoferrate(II)(‘Prussian Blue’) is shown voltammetrically to deposit from a solution of Fe³⁺ and hexacyanoferrate(III) by two dominant electroreductions. The progenitor species is probably the 1 : 1 complex which diffuses to the electrode. Reoxidation is only partly achieved, to ‘Prussian Green’(PG), also occurring in two forms. The composition of PG, as containing [Fe^III(CN)₆]_⅔[Fe^II(CN)₆]_⅓, is confirmed coulometrically and mechanistic detail is clarified.