Acta Cryst. (2013). E69, m125
[ doi:10.1107/S1600536813002274 ]

catena-Poly[[bis(₂-1,4,7,10,13,16-hexaoxacyclooctadecane)dipotassium]-₂-iodido-(iodidocadmium)-di-₂-iodido-(iodidocadmium)-₂-iodido]

K. Rajarajan, A. Pugazhenthi and M. NizamMohideen

Abstract: The reaction of CdCl₂, 18-crown-6 and KI in water yields the title coordination polymer, [{K(C₁₂H₂₄O₆)}₂Cd₂I₆]_n. The potassium ion lies approximately in the plane of the crown ether, coordinated by all six crown ether O atoms and also by an iodide anion bound to a cadmium atom. A C atom of the crown ether is disordered over two positions with site occupancies of 0.77 (2) and 0.23 (2). Two K(18-crown-6)⁺ units are linked by inversion symmetry, forming a [bis(₂-18-crown-6)dipottasium] system with approximately square-planar K₂O₂ units. Inversion symmetry also generates the Cd₂I₆ fragment and the polymeric system is extended along the c axis by the formation of K-I-Cd bridges.

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