Abstract
A complex [Ca(18C6)(H2O)3]2+(ClO 4 − · 18C6 · H2O is synthesized and studied by X-ray diffraction analysis. The structure (space group P21/n, a = 11.570 A, b = 16.024 A, c = 22.225 A, β = 98.89°, Z = 4) is solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.075 for 5305 independent reflections (CAD4 automated diffractometer, λMoK α radiation). In the complex cation of the host-guest type, the Ca2+ cation lies in the cavity of the 18-crown-6 ligand and is coordinated by all the six O atoms and three O atoms of three water molecules. In a crystal, the alternating complex anions, 18C6 molecules, and water molecules are joined by hydrogen bonds into broad infinite chains along the y axis. The disordered ClO 4 − anions are bonded to these chains on the side through hydrogen bonds.
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