heteropoly salt

A heteropoly salt is a chemical compound derived from heteropoly acids. These acids are complex oxygen-containing acids formed when two or more different inorganic acids combine, often involving acid anhydrides like molybdenum trioxide or tungsten trioxide, along with a central atom from another acid, such as phosphorus or silicon.1

Heteropoly acids and their salts are formed when certain metals, like those in groups VB and VIB, condense their acid anhydrides. This condensation can occur with a single type of acid anhydride (forming isopoly acids and salts) or with other acids (forming heteropoly acids and salts).2

These compounds can have complex structures with central atoms surrounded by oxo anions. They are known for their high molecular weights, solubility in water and organic solvents, and tendency to be highly hydrated. Historically, they have been used in analytical chemistry and have found applications as catalysts, molecular sieves, and corrosion inhibitors.2