hexacyanocobaltateIII

Hexacyanocobaltate(III) is a coordination compound with the chemical formula [Co(CN)6]3−. It features a cobalt metal center in the +3 oxidation state coordinated by six cyanide (CN−) ligands arranged octahedrally around the metal ion. This complex is part of the family of hexacyanometalates, known for their robust metal-ligand bonds and distinctive deep blue coloration.

The compound is typically synthesized through the reaction of cobalt(III) salts, such as cobalt(III) chloride or cobalt(III) sulfate, with potassium cyanide under controlled conditions, resulting in potassium hexacyanocobaltate(III). Due to the toxicity of cyanide compounds, proper safety precautions are essential during synthesis and handling.

Hexacyanocobaltate(III) exhibits notable stability in aqueous solutions under neutral and slightly alkaline conditions. It is primarily used as an intermediate in the production of other cyanide complexes and in various electrochemical applications, including as a precursor for electroplating and in the fabrication of cyanide-based electrode materials.

The compound displays paramagnetic properties owing to its d^6 low-spin configuration in a weak field environment, influencing its magnetic behavior. Its stability and color make it useful for analytical purposes and in the study of coordination chemistry.

In solution, hexacyanocobaltate(III) can undergo ligand exchange reactions, especially under reductive conditions, leading to different cobalt cyanide complexes. Due to its toxicity and potential environmental hazards, careful disposal and handling are mandated in laboratory and industrial settings.