REACTIONS OF CADMIUM AND MERCURY(II) HALI DES AND PSEUDOHALIDES WITH CROWN-ETHERS - CRYSTAL-STRUCTURES OF THE COMPLEXES OF BENZO-18-CROWN-6WITH CDX2 AND HGX2 (X = CL, BR) AND OF DIBENZO-18-CROWN-6 WITH HG(CN)(2)

The reactions of benzo-18-crown-6 with MeX2 (Me = Cd, Hg, X = Cl, Br), and of dibenzo-18-crown-6 with Hg(CN)(2) afford the compounds [Me(ben zo-18-crown-6)X-2] (1-4) and [Hg(dibenzo-18-crown-6)(CN)(2) (5), resp. , the crystal structures of which were determined. They consist of iso lated neutral molecules, the crystalline Cd complexes and 5 contain on e molecule of water of crystallization per formula unit, which however is not coordinated to the metal atom. The metal atoms are coordinated by the six O atoms of the ligands and the two halide atoms, or the tw o CN groups for 5, resp., the coordination being more unsymmetrical fo r the benzo than for the dibenzo ligand.