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artículo con referato
"Disodium zinc bis(sulfate) tetrahydrate (zinc astrakanite) revisited"
M.E. Díaz de Vivar, S. Baggio, A. Ibáñez and R. Baggio
Acta Cryst. E 64(6) (2008) i30-i31
We present a new low-temperature refinement of disodium zinc bis(sulfate) tetrahydrate {systematic name: poly[tetra-μ-aqua-di-μ-sulfato-zinc(II)disodium(I)]}, [Na2Zn(SO4)2(H2O)4]n or Zn astrakanite, which is an upgrade of previously reported data [Bukin & Nozik (1974). Zh. Strukt. Khim. 15, 712-716]. The compound is part of an isostructural family containing the Mg (the original astrakanite mineral), Co and Ni species. The very regular ZnO(aqua)4O(sulfate)2 octahedra lie on centres of symmetry, while the rather distorted NaO(aqua)2O(sulfate)4 octahedra appear at general positions, linked into a three-dimensional network by the bridging water molecules and the fully coordinated sulfate groups.
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