[Open access]

Acta Cryst. (2013). E69, i25
[ doi:10.1107/S1600536813008416 ]

Dilithium hexahydroxidostannate(IV) dihydrate, a second monoclinic modification with a layer structure

S. Kamaha and H. Reuter

Abstract: The title compound, Li2[Sn(OH)6]·2H2O, is dimorphic. As for the previously described [alpha]-modification, the title [beta]-modification crystallizes in the monoclinic system and contains the same primary building units, viz [Sn(OH)6]2- octahedra and [Li([mu]2-OH)3(H2O)] tetrahedra. In contrast to the Sn-O bond lengths that are very similar in both modifications, the Li-O bond lengths differ significantly, in particular those involving the water molecule. In the new [beta]-modification, the primary building units are linked into layers parallel to (010). The [Sn(OH)6]2- octahedra (-1 symmetry) form hexagonal nets and the [Li([mu]2-OH)3(H2O)] tetrahedra are situated in between, with their apices in an alternating fashion up and down. O-H...O hydrogen bonds between OH groups and water molecules exist within the layers as well as between them.

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