Acta Cryst. (2003). E59, m1184-m1186  [ doi:10.1107/S160053680302676X ]

(18-Crown-6)-bis(tetrahydrofuran)potassium iodide

S. T. Liddle and W. Clegg

Abstract: The title compound, [K(C₁₂H₂₄O₆)(C₄H₈O)₂]I, has iodide anions on crystallographic twofold rotation axes and cations in general positions. The coordination of potassium is distorted hexagonal bipyramidal, with an 18-crown-6 ligand as an equatorial belt and two axial tetrahydrofuran ligands. Distortion is marked, consisting mainly of a significant bending of the axial arrangement [O-K-O = 148.53 (13)°] and a shortening of the two equatorial K-O bonds closest to the axial O atoms. This conformation is unprecedented in the previous reports of this cation, with almost thirty different occurrences in nearly twenty crystal structures.

Online 29 November 2003

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