Layered alkali propano-ates M +(C2H5COO)-; M + = Na+, K+, Rb+, Cs.

ABSTRACT: The title alkali propano-ates poly[(?5-propano-ato)alkali(I)], M +(C2H5COO)-, with alkali/M + = Na+, K+, Rb+ and Cs+, show close structural similarity, which is manifested by the coordination of the cations by six oxygen atoms in a chessboard motif, forming a bilayer. This bilayer is situated between hydro-phobic layers composed of dangling ethyl chains from the carboxyl-ate groups. Stacking of these two-dimensional sandwiches, which are parallel to (001), forms the title structures. Each metal cation is coordinated by six O atoms in the form of a distorted trigonal prism. One pair of these oxygen atoms belongs to a bridging, bidentately coordinating carboxyl-ate anion, while each of the other four oxygen atoms belongs to different carboxyl-ate groups, which are in a bridging monodentate mode. Despite the close similarity, each of the studied alkali propano-ates crystallizes in a different space group. The atoms are in general positions, except for the cation in K+(C2H5COO)-, which is situated on a mirror plane. Positional disorder of the methyl groups that are disordered over two positions is present in the Na+ and K+ propano-ates, in contrast to the Rb+ and Cs+ propano-ates. In the Na+ compound, the occupational parameters of the disordered methyl groups are different compared to the K+ compound where they are equal. This difference results in doubling of the a unit-cell parameter of the Na+ compound with respect to that of the K+ compound, otherwise the structures are homeotypic. In Cs+ propano-ate, a disorder of the methyl H atoms is observed.

SUBMITTER: Fabry J 

PROVIDER: S-EPMC7472758 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature