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The reaction of CdCl 2 , 18-crown-6 and KI in water yields the title coordination polymer, [{K(C 12 H 24 O 6 )} 2 Cd 2 I 6 ]  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(μ 2 -18-crown-6)dipottasium] system with approximately square-planar K 2 O 2  units. Inversion symmetry also generates the Cd 2 I 6  fragment and the polymeric system is extended along the  c  axis by the formation of K—I—Cd bridges.

acta crystallographica. section e

catena-Poly[[bis(μ2-1,4,7,10,13,16-hexaoxacyclooctadecane)dipotassium]-μ2-iodido-(iodidocadmium)-di-μ2-iodido-(iodidocadmium)-μ2-iodido]