Heteropolytungstate (Polyoxometalates, POMs. Heteropolytungstate) is a kind of multi-nuclear multi-charged polymer composed of multiple tungsten atoms and oxygen atoms. They are a special kind of inorganic compounds, usually with complex structures and diverse chemical properties. Heteropolytungstates can be synthesized by a variety of methods, the most common of which are hydrothermal and solution methods. In the hydrothermal method, the desired heteropolytungstate compounds can be obtained by mixing and reacting appropriate raw materials under high temperature and high pressure conditions. The solution method is to react a suitable tungstate and a reducing agent in a solution to form a heteropolytungstate.
The chemical formula of heteropolytungstate is usually Hx[α-P2W18O62], where H represents hydrogen ion and x represents the charge balance of heteropolytungstate. α-P2W18O62 is a common heteropolytungstate ion, which consists of two phosphate ions (P2O7) and eighteen tungsten-oxygen octahedral clusters (W18O62). In addition to α-P2W18O62, there are many other types of heteropolytungstate ions that can vary in structure and composition. Heteropolytungstate has many special properties and applications. Due to their complex structure and multi-nuclear and multi-charge characteristics, they have good catalytic activity, optoelectronic performance and magnetic properties. Heteropolytungstates are widely used in the field of catalysis, and can be used as catalysts in oxidation reactions, reduction reactions, acid-base reactions, and organic synthesis. In addition, heteropolytungstates also show broad application prospects in photocatalysis, electrochemistry, fluorescent probes, and drug delivery.
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