1999 structure

structure (solids and liquids)D 2000

49 - 009(NH4)2 [Mg4(H2O)18 (H2W12O42)]·10H2O, a New CompoundContaining Chains Formed by Magnesium and ParadodecahedralTungstate Ions. — The new title compound is prepared by reaction of(NH4)10[H2W12O42] with MgCl2 in aqueous solution (reflux→353 K). (NH4)2[Mg4(H2O)18 (H2W12O42)]·10H2O crystallizes in the monoclinic space groupP21/n with Z = 2. The skeleton of the paradodecatungstate ion [H2W12O42]10−

is basically the same as those in the known paradodecatungstates. It consistsof 12 interconnected WO6 octahedra. Both crystallographically independentMg atoms are octahedrally coordinated by six O atoms. One MgO6 octa-hedron shares one oxygen with a paradodecatungstate group and the otheroctahedron bridges two paradodecatungstate groups to form ∞1 [Mg4(H2O)18(H2W12O42)2−] chains along the b direction. — (LI, JING; WANG, RU-JI;TORARDI, CHARLIE C.; Acta Crystallogr., Sect. C: Cryst. Struct. Commun.55 (1999) 9, 1388-1391; Dep. Chem., Rutgers Univ., Camden, NJ 08102, USA;EN)

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