Acta Cryst. (2003). E59, m1062-m1064  [ doi:10.1107/S1600536803023821 ]

Polymeric (18-crown-6)bis(2-amidopyridinecaesium) toluene solvate

S. T. Liddle and W. Clegg

Abstract: The title compound, catena-poly[[caesium(I)--18-crown-6-caesium(I)-di--2-amidopyridine] toluene], [{[Cs{2-N(H)C₅H₄N}]₂(C₁₂H₂₄O₆)·(C₆H₅CH₃)}] or [Cs₂(C₅H₅N₂)₂(C₁₂H₂₄O₆)]·C₇H₈, crystallizes as a toluene solvate. The polymeric structure is constructed from dimeric amido-bridged Cs₂N₂ four-membered rings with additional supporting coordination by bridging pyridyl N atoms. Each dimeric unit is linked to the next in the polymeric chain by bridging ⁶:⁶ 18-crown-6 ether molecules, in which each of the six O atoms bonds to both caesium ions; each caesium is ten-coordinate. The polymer has crystallographic mirror (C_s) symmetry, the mirror running through all the caesium ions, so that there is only one unique amidopyridine ligand and each crown ligand is bisected by the mirror. Consequently, the amide ligands are arranged cis with respect to each other, which is unusual.

Online 23 October 2003

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