Abstract. M r = 3455.2, monoclinic, P21, a -----13. 122 (2), b= 21.457 (4), c= 13.223 (1)A, fl= 91.71(1) °, V=3721 (1)A 3, Z=2, Dm=3.11, D x =-3.09 Mg m -3, Mo Ka, /l = 0.71069 A, p = 19.7 mm -~, F(000) = 1559, T= 293 K, R = 0-085 for 6585 independent reflexions. The metadodecatungstate anion consists of four tetrahedrally corner-shared W3013 units made by edge-sharing WO 6, and is therefore confirmed to be the Keggin type. The molecule has T d symmetry and its framework is regarded as a regular cubo-octahedron. The average W-W distance is 3.33 (1)A within the same W30~3 unit and 3.63 (2)A, otherwise. The W-O bond lengths, formally classified into four types, are 1.71 (4), 1.91 (5), 1.96 (9) and 2.22 (9) A. The O atoms forming the tetrahedral cavity are 2.95 (6) A distant from one another, suggesting that the cavity is capable of containing two non-acidic H atoms.
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