Notizen: Synthese und Kristallstruktur von [Co(15-Krone-5)(CH3CN)2]CoCl4 · CH3CN / Synthesis and Crystal Structure of [Co( 15-Crown-5)(CH3CN)2]CoCl4 · CH3CN

The title compound has been prepared by the reaction of 15-crown-5 with a solution of CoCl2 in acetonitrile. It forms blue crystals, which were characterized by an X-ray structure determination. Space group Pca 21, 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)(CH3CN)2]2+ and CoCl42-, and interstitial CH3CN molecules. In the cation CoII 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.