Rerefinement of poly[di-aqua-bis-(μ₃-2-methyl-pro-pano-ato-κ⁴ O:O,O':O')bis-(μ₃-2-methyl-propano-ato-κ³ O:O:O)(μ₂-2-methyl-propano-ato-κ³ O:O,O')(2-methyl-propano-ato-κ² O,O')trilead(II)].

ABSTRACT: The crystal structure of the title complex, [Pb₃(C₄H₇O₂)₆(H₂O)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-methyl-propano-ate 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 carboxyl-ate groups or water mol-ecules. This arrangement leads to the formation of sheets parallel to (01), whereby the hydro-phobic 2-methyl-propanyl groups of the anions are oriented above and below the hydro-philic sheets to form a layered structure. Within a sheet, hydrogen bonds of the type O_water-H⋯O are formed, whereas the hydro-phobic groups between adjacent layers inter-act through van der Waals forces.

SUBMITTER: Samolova E 

PROVIDER: S-EPMC9462163 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature