Abstract
New mixed complex compound aqua(dibenzo-18-crown-6)potassium (dibenzo-18-crown-6)(tetrachlorocuprato(II)-Cl)potassium, [K(CuCl4)(Db18C6)]− · [K(Db18C6)(H2O)]+, is synthesized and its crystal structure is studied by the method of x-ray structural analysis. The structure includes two independent complex ions, both of guest-host type: two cations K+ are located in the respective cavities of the Db18C6 crown-ligand (one in each) and each is coordinated by all its six O atoms and one Cl atom of the anion-ligand [CuCl4]2− or O atom of the ligand water molecule. Coordination of these two K+ cations is completed to hexagonal pyramidal one by formation by each of unusually weak coordination bond K+ → π(\( C\dddot - C \)) with two C atoms of respective benzene ring in the neighboring Db18C6 ligand. In this crystal structure the complex anions and cations form dual infinite chains via these coordination bonds and interionic O-H⋯Cl hydrogen bonds.
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