Abstract
Two new complexes were synthesized, namely, 7: 2 (2.2.2-cryptand)potassium chloride and (2.2.2-cryptand)ammonium bromide(0.75)chloride(0.25) hydrates: [M(Crypt-222)]+ · Hal− · 3.5H2O, where M = K, Hal = Cl (I) and M = NH4, Hal = Br0.75Cl0.25 (II). The structures of two isomorphous crystals were studied by X-ray diffraction analysis. Trigonal (space group P \( \bar 3 \), Z = 2) structures I (a = 11.763 Å, c = 11.262 Å) and II (a = 11.945 Å, c = 11.337 Å) were solved by direct methods and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.057 (I) and 0.065 (II) for all 2626 (I) and 1654 (II) independent measured reflections (CAD-4 automated diffractometer, λMoK α). In structures I and II, the host-guest [M(Crypt-222)]+ complex cation lies on the threefold crystallographic axis and has the approximate D 3 symmetry. In complex I, the coordination polyhedron of the K+ cation (CN = 8) is a bicapped trigonal prism somewhat distorted toward an antiprism. Complexes I and II contain H-bonded disordered cubes of the water molecules and the Cl− or Br− anions.
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Original Russian Text © A.N. Chekhlov, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 2, pp. 324–330.
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Chekhlov, A.N. Syntheses and crystal structures of (2.2.2-cryptand)potassium chloride and (2.2.2-cryptand)ammonium bromide(0.75)chloride(0.25) hydrates. Russ. J. Inorg. Chem. 54, 280–286 (2009). https://doi.org/10.1134/S003602360902020X
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DOI: https://doi.org/10.1134/S003602360902020X