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The crystal structure of the title complex, [Pb 3 (C 4 H 7 O 2 ) 6 (H 2 O) 2 ] n , was redetermined on basis of modern CCD-based single-crystal X-ray data at 120 K. The current study basically confirms the previous report [Fallon  et al.  (1997).  Polyhedron ,  16 , 19–23] at 190 K, but with higher accuracy and precision. In particular, positional disorder of one of the 2-methylpropanoate anions over two sets of sites was resolved, showing a refined ratio of the disorder components of 0.535 (9):0.465 (9). The three independent cations in the structure have coordination numbers of [7 + 1], [6 + 1], and [5 + 3], with O atoms belonging either to carboxylate groups or water molecules. This arrangement leads to the formation of sheets parallel to (\overline{1}01), whereby the hydrophobic 2-methylpropanyl groups of the anions are oriented above and below the hydrophilic sheets to form a layered structure. Within a sheet, hydrogen bonds of the type O water —H...O are formed, whereas the hydrophobic groups between adjacent layers interact through van der Waals forces.

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Rerefinement of poly[diaquabis(μ3-2-methylpropanoato-κ4O:O,O′:O′)bis(μ3-2-methylpropanoato-κ3O:O:O)(μ2-2-methylpropanoato-κ3O:O,O′)(2-methylpropanoato-κ2O,O′)trilead(II)]