Crystal structure of catena-poly[[potassium-tri-μ-di­methyl­acetamide-κ(6) O:O] iodide]

The structure of catena-poly[[potassium-tri-μ-di­methyl­acetamide-κ(6) O:O] iodide], {[K(C(4)H(9)NO)(3)]I}(n), at 120 K has trigonal (P-3) symmetry. The structure adopts a linear chain motif parallel to the crystallographic c axis. Two crystallographically independent K(+) cations are present in the asymmetric unit located on threefold rotoinversion axes at [0, 0, 0] and [0, 0, 1/2] and are bridged by the O atoms of the acetamide moiety. This is an example of a rare μ(2)-bridging mode for di­methyl­acetamide O atoms. The iodide counter-ion resides on a threefold rotation axis in the channel formed by the [K(C(4)H(9)NO)](+) chains.