Fig. 1. The phosphotungstate anion, an example of a polyoxometalate
In chemistry, a polyoxometalate (abbreviated POM) is a polyatomic ion, usually an anion, that consists of three or more transition metal oxyanions linked together by shared oxygen atoms to form a large, closed 3-dimensional framework. Examples include vanadium(V), niobium(V), tantalum (V), molybdenum(VI), and tungsten(VI).
The framework of transition metal oxyanions may enclose one or more hetero atoms such as phosphorus or silicon, themselves sharing neighbouring oxygen atoms with the framework.
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