Anions

Keggin structure

Keggin structure is the best known structural form for heteropoly acids. It is the structural form of α-Keggin anions, which have a general formula of [XM12O40]n−, where X is the heteroatom (most commonly are pentavalent phosphorus PV, tetravalent silicon SiIV, or trivalent boron BIII), M is the addendum atom (most common are molybdenum Mo and tungsten W), and O represents oxygen. The structure self-assembles in acidic aqueous solution and is the most stable structure of polyoxometalate catalysts. (Wikipedia).

Keggin structure
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From playlist New Organic Chemistry Playlist

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From playlist New Organic Chemistry Playlist

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From playlist A Level Biology Biological Molecules

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From playlist Mathematics

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From playlist Atomic Structures and Bonding

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Equidistant | Proton | Bond length | Phosphotungstic acid | Angstrom | Point groups in three dimensions | Octahedral molecular geometry | Tetrahedral molecular geometry | Tetrahedron