Acta Cryst. (2013). E69, i25
[ doi:10.1107/S1600536813008416 ]
Abstract: The title compound, Li2[Sn(OH)6]·2H2O, is dimorphic. As for the previously described -modification, the title -modification crystallizes in the monoclinic system and contains the same primary building units, viz [Sn(OH)6]2- octahedra and [Li(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 -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(2-OH)3(H2O)] tetrahedra are situated in between, with their apices in an alternating fashion up and down. O-HO hydrogen bonds between OH groups and water molecules exist within the layers as well as between them.
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