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Reference.org
Keggin structure
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<p>The Keggin structure is the best known structural form for <a href="/facts/Heteropoly_acid/rQyeQAYM">heteropoly acids</a>. It is the structural form of α-Keggin anions, having a general formula of [XM12O40]<i>n</i>−, where X is the <a href="/facts/Heteroatom/QzxXyfCT">heteroatom</a> (most commonly are pentavalent phosphorus PV, tetravalent silicon SiIV, or trivalent boron BIII), M is the addendum atom (most common are <a href="/facts/Molybdenum/RX6vp2bF">molybdenum</a> Mo and <a href="/facts/Tungsten/WYwbNDYX">tungsten</a> W), and O represents <a href="/facts/Oxygen/acyn6o8r">oxygen</a>. The structure self-assembles in acidic aqueous solution and is a commonly used as a type of polyoxometalate <a href="/facts/Catalyst/LPBS7TQC">catalysts</a>. </p>