Synthesis and Crystal Structure of Aqua(dibenzo-18-crown-6)potassium (Dibenzo-18-crown-6)-(tetrachlorocuprato(II)-Cl)potassium

New mixed complex compound aqua(dibenzo-18-crown-6) potassium (dibenzo-18-crown-6)(tetrachlorocuprato(II)-Cl) potassium, [K(CuCl4)(Db18C6)](-)center dot[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+ -> pi(C=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 center dot center dot center dot Cl hydrogen bonds.