hydroxyvanads

Hydroxyvanadates are a class of inorganic compounds containing vanadium in its +5 oxidation state, characterized by the presence of hydroxyl (OH) groups in their structure. They are derived from vanadic acid, which is unstable and readily polymerizes. Hydroxyvanadates represent a more stable form of vanadic acid species in aqueous solutions, often existing as polyanions. The specific composition and structure of hydroxyvanadates depend on factors such as pH, vanadium concentration, and the presence of other cations.

In solution, hydroxyvanadates can exist as various species, including monomeric metavanadates ([VO2(OH)]2-), dimeric decavanadates ([V10O28]6-), and other polymeric forms. The decavanadate anion is particularly well-known and is often encountered in neutral to slightly acidic solutions. These species play a role in the chemistry of vanadium in natural waters and in various industrial processes.

Solid hydroxyvanadates can be isolated as salts containing these polyanions and accompanying cations, such as sodium, potassium, or ammonium. Their properties vary widely depending on the cation and the specific vanadium-oxygen-hydroxyl framework. Some hydroxyvanadates exhibit interesting catalytic or electrochemical properties. The study of hydroxyvanadates is important for understanding the speciation and reactivity of vanadium in different chemical environments and for potential applications in catalysis, materials science, and environmental remediation.