Electrochemical and mechanochemical formation of solid solutions of potassium copper(II)/zinc(II) hexacyanocobaltate(III)/hexacyanoferrate(III) KCu x Zn1-x [hcc] x [hcf]1-x

Electrochemical reduction/oxidation cycles of immobilised powder mixtures of KCuhcc] and KZnhcf] as well as their mechanical milling lead to the formation of a quaternary solid solution (mixed crystals) with Cu²⁺ and Zn²⁺ on the nitrogen coordinated sites and Fe³⁺ and Co³⁺ on the carbon coordinated sites. The reaction products were studied by the X-ray diffractometry and voltammetric techniques. The formation of solid solutions of the general formula KCu_xZn_1-xhcc]_xhcf]_1-x is the first example of an electrochemical and mechanochemical reaction leading to mixed hexacyanometalates.Dedicated to Professor Dr. G. Horányi on the occasion of his 70th birthday.