Fe(CN)₆, or ferricyanide, is a complex ion consisting of iron (Fe) and cyanide (CN) ligands. It typically exists in two forms: ferrocyanide (Fe(CN)₆²⁻) and ferricyanide (Fe(CN)₆³⁻). These compounds are often used in various applications, including photography, electrochemistry, and as pigments. The structure of Fe(CN)₆ features a central iron atom surrounded by six cyanide groups arranged octahedrally. This configuration allows for unique chemical properties, making it useful in analytical chemistry for detecting metals and in the production of blue pigments like Prussian blue.