hexacyanometalaten

Hexacyanometalates are a class of coordination complexes with the general formula [M(CN)6]n-, where M is a transition metal and n is the charge on the complex. These complexes are notable for their high stability and symmetrical structure, which arises from the octahedral arrangement of the cyanide ligands around the central metal ion. The cyanide ligands in hexacyanometalates are typically bonded to the metal through carbon, forming a σ-bond, and the nitrogen atom forms a π-backbonding interaction with the metal's d-orbitals.

Hexacyanometalates are often prepared by reacting a metal salt with potassium cyanide in an aqueous solution. The resulting complexes can be isolated and characterized using various spectroscopic techniques, such as infrared spectroscopy and electronic spectroscopy. These complexes are also of interest in the field of materials science, as they can exhibit interesting optical and electronic properties.

One of the most well-known hexacyanometalates is the iron(III) complex, [Fe(CN)6]3-, which is commonly used as a redox indicator in analytical chemistry. Other notable hexacyanometalates include the cobalt(III) complex, [Co(CN)6]3-, and the chromium(III) complex, [Cr(CN)6]3-. These complexes have been studied extensively for their potential applications in areas such as catalysis, electrochemistry, and magnetism.