Abstract
A 3: 1: 1 crystalline adduct of orthophosphoric acid, crown ether dibenzo-18-crown-6, and water, 3H3PO4 · Db18C6 · H2O (I), is synthesized and studied by X-ray diffraction analysis. The orthorhombic structure of compound I (space group Pmn21, a = 23.123 A, b = 12.595 A, c = 4.922 A, Z = 2) is solved by a direct method and refined by full-matrix least squares in the anisotropic approximation to R = 0.061 by all 1894 independent reflections. One H3PO4 molecule and Db18C6 and H2O molecules lie on the crystallographic plane m. The H3PO4 molecules are randomly disordered. The H atoms of the H3PO4 and H2O molecules are not objectively revealed because of high disordering. The Db18C6 and H2O molecules form the host-gust molecular complex [Db18C6 · H2O] through hydrogen bonds. All H3PO4 molecules are hydrogenbonded to form infinite layers lying parallel to the xz plane. The [Db18C6 · H2O] molecular complexes are arranged between the layers.
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