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The structure of the first heteropolyanion, [P4W8O40]12–, with an X:M ratio of 1:2, has been determined from single crystal X-ray studies of the sodium salt; the idealized anion has ![[4 with combining macron]](https://www.rsc.org/images/entities/char_0034_0304.gif)
2m symmetry and consists of a shell of WO6 octahedra and PO4 tetrahedra made up of four PW2O13 groups linked by corner sharing and a sodium atom is situated in the centre of the polyanion.
B. M. Gatehouse and A. J. Jozsa, J. Chem. Soc., Chem. Commun., 1977, 674 DOI: 10.1039/C39770000674
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