Die Kristallstruktur des Li2ZnCl4· 2H2O

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Abstract
Li 2 ZnCl 4 · 2H 2 O crystallizes from aqueous solutions with unit-cell dimensions a = 10.24 Å, b = 11.98 Å, c = 6.44 Å. The space group is P 2 1 2 1 2 1 with Z = 4. The structure has been determined by two-dimensional Patterson, Fourier and difference Fourier syntheses and refined three-dimensionally by the method of least squares to a final R = 0.049 for 989 independent reflections. Zn is tetrahedrally coordinated by four Cl; the tetrahedra are not directly linked together. The two Li are octahedrally surrounded by four Cl und two H 2 O. These octahedra are rather distorted and connected in a slightly undulated layer arrangement [similarly as e.g. in γ -Al(OH) 3 ] thus forming nearly regular tetrahedral holes between the layers. These interstices are occupied by Zn. Because of their structural positions both H 2 O are supposed to have tetrahedral distributions of charge.

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