Key indicators Single-crystal X-ray study T = 296 K Mean '(Ge±O) = 0.013 A Ê Some non-H atoms missing Disorder in solvent or counterion R factor = 0.076 wR factor = 0.163 Data-to-parameter ratio = 24.5 For details of how these key indicators were automatically derived from the article, see The title compound, 8.5-sodium 1.5-hydrogen tetratriacontaoxononatungstomonogermanate(10À) icosahydrate, contains A--and A--type trivacant Keggin [GeW 9 O 34 ] 10À anions, which are disordered in an

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... ely 1:9 ratio. Pairs of anions related by a center of symmetry are linked via OÐNaÐO bonding to form a quasi-sandwich-type Figure 1 ORTEPII (Johnson, 1976) drawings of the [GeW 9 O 34 ] 10À anion, showing (a) the A--isomer only and (b) the A--isomer with atoms W10, W11 and W12 of the -isomer, viewed along the C 3 axis. The ®lled bonds link W10±W12 and O ligands of the anion. The ®lled displacement ellipsoids are drawn at the 50% probability level.