Synthesis and crystal structure of (2.2.2-cryptand)potassium nitrate hydrate

(2.2.2-Cryptand)potassium nitrate hydrate, [K(Crypt-222)](NO3) center dot 1.5H(2)O (I) was synthesized and studied by X-ray diffraction method. Crystals I are triclinic (space group P (1) over bar, a = 11.262 angstrom, b = 12.033 angstrom, c = 12.181 angstrom, alpha = 60.48, beta = 86.17, gamma = 66.20 degrees, Z= 2). The structure was solved by the direct method and refined by the full-matrix least-squares method in anisotropic approximation to R = 0.065 from 3377 independent reflections (CAD-4 automated diffractometer, lambda MoKalpha,). In complex I, the host-guest complex cation [K(Crypt-222)](+) has approximate D-3 symmetry. The coordination polyhedron of the K+ cation is a two-base-centered trigonal prism, which is slightly distorted toward antiprism. The disordered NO3- anions and water molecules are united by hydrogen bonds into infinite chains along the x-axis.