摘要:
1,4,7,10,13,16-Hexaoxacyclooctadecane-kappa(6)O) potassium pentaiodide, [K(C12H24O6)] I-5, obtained by slow evaporation of an ethanol solution of KI, 18-crown-6 and I-2, contains [K(18-crown- 6)](+) cations (C-i symmetry) and I-5(-) anions (C-2 symmetry), which are arranged in alternating layers parallel to (001). In contrast to the well known tendency of I-5(-) ions to form chains and nets, the I-5(-) units in the title compound are isolated.