Crystal structure of catena-poly[[potassium-tri-μ-dimethylacetamide-κ6O:O] iodide]

• Main Authors: Cezar-Catalin Comanescu, Allen G. Oliver
• Format: Article
• Language: English
• Published: International Union of Crystallography 2014-10-01
• Series: Acta Crystallographica Section E
• Subjects: crystal structure; one-dimensional coordination polymer; symmetry; dimethylacetamide; potassium salt
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536814020005

The structure of catena-poly[[potassium-tri-μ-dimethylacetamide-κ6O:O] iodide], {[K(C4H9NO)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 μ2-bridging mode for dimethylacetamide O atoms. The iodide counter-ion resides on a threefold rotation axis in the channel formed by the [K(C4H9NO)]+ chains.