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The title compound, Li2[Sn(OH)6]·2H2O, is dimorphic. As for the previously described α-modification, the title β-modification crystallizes in the monoclinic system and contains the same primary building units, viz [Sn(OH)6]2− octa­hedra and [Li(μ2-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 β-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(μ2-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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The title compound, [Sn(C4H9)2(CH3COO)2], was synthesized in order to study the influence of large organic groups on the mol­ecular structure of diorganotin di­acetates. The title compound exhibits the same structure type as other diorganotin(IV) di­acetates characterized by an unsymmetrical bidentate bonding mode of the two acetate groups to tin. The influence of the t-butyl groups on this mol­ecular structure is expressed in two significant differences: tin—carbon bond lengths are much more longer than in the other di­acetates, as are the additional inter­actions of the acetate groups with the tin atom. Inter­molecular inter­actions are restricted to C—H...O ones similar to those in the other di­acetates, giving rise to a chain-like arrangement of the molecules with the tin atoms and acetate groups in the propagation plane.
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