A. N. Chekhlov
Aug 1, 2006
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Journal
Russian Journal of Inorganic Chemistry
Abstract
AbstractA new compound, aqua(dibenzo-18-crown-6)potassium (dibenzo-18-crown-6)(perchlorato-O)potassium perchlorate ([K(DB18C6)(H2O)]+ · [K(ClO4)(DB18C6)] · ClO4−; compound I) is synthesized and studied by X-ray crystallography. The crystals are triclinic: a = 9.050 Å, b = 9.848 Å, c = 26.484 Å, α = 82.87°, β = 84.16°, γ = 77.93°, Z = 2, space group P $$\bar 1$$ . The structure is solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.058 for 5960 independent reflections (CAD4 diffractometer, λMoKα radiation). A complex cation [K(DB18C6)(H2O)]+ and a complex molecule [K(ClO4)(DB18C6)] are of the host-guest type; they are linked into a dimer through two K+ → π(C) bonds formed by one of the two K+ cations with two C atoms of the benzene ring of the DB18C6 ligand from the adjacent complex. Both DB18C6 ligands in I have a butterfly conformation with approximate symmetry C2v.