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The title compound has been prepared by the reaction of 15-crown-5 with a solution of CoCl 2  in acetonitrile. It forms blue crystals, which were characterized by an X-ray structure determination. Space group Pca 2 1 , Z = 4, 2883 observed unique reflexions, R = 0.032. Lattice dimensions at –80 °C: a = 1420.9(3), b = 1017.2(2), c = 1775.0(3) pm. The lattice contains the complex ions [Co(15-crown-5)(CH 3 CN) 2 ] 2+  and CoCl 4  2- , and interstitial CH 3 CN molecules. In the cation Co II  is seven-coordinate by the five oxygen atoms of the crown ether molecule and by two nitrogen atoms of the acetonitrile molecules in axial positions of a pentagonal bipyramide.

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Notizen: Synthese und Kristallstruktur von [Co(15-Krone-5)(CH 3 CN) 2 ]CoCl 4  · CH 3 CN / Synthesis and Crystal Structure of [Co( 15-Crown-5)(CH 3 CN)2]CoCl 4  · CH 3 CN