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

摘要

New mixed complex compound aqua(dibenzo-18-crown-6)potassium (dibenzo-18-crown-6)(tetra-chlorocuprato(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 DM8C6 crown-ligand (one in each) and each is coordinated by all its six O atoms and one Cl atom of the anion-lig and [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—C) with two C atoms of respective benzene ring in the neighboring DM8C6 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.