Abstract
Crystalline bis(dibenzo-18-crown-6)rubidium triiodide complex [Rb(DB18C6)2]+ · I3– (I) is synthesized and its structure is studied by X-ray diffraction analysis. The structure of I (space group Pnma, a = 23.854 A, b = 23.612 A, c = 7.863 A, Z = 4) is solved by the direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.079 against 3990 independent reflections (CAD4 automated diffractometer, λMoKα). Structural units of crystal I are the I3– anions and [Rb(DB18C6)2]+ cations. The crystal has the structure intermediate between that of a standard host–guest complex and a sandwich complex. In the structure of complex I, the crystallographic plane with symmetry m passes through the I3– anion (perpendicularly to its axis) and complex cation. The coordination polyhedron of the Rb+ cation is a strongly distorted hexagonal pyramid with the O atom of one crown ligand at the axial vertex and a base of six O atoms of another DB18C6 crown ligand.
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