Polymetal oxyates (polyoxometalates, or POMs) are polymetallic clusters of pre-transition metal ions (W6 plus, Mo6 plus V5 plus, etc.) connected to central heteroatoms. Polyacid is mainly composed of the basic structure of the tetrahexon and the octahex, these octahec MO6 units and the central hemerizing atom formed by the tetrahexon XO4 unit by the common edge, co-angle, conjugation form a different multi-anion configuration, making polyacid has a complex and diverse structure
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