Acta Cryst. (2006). E62, o1550-o1552  [ doi:10.1107/S1600536806009342 ]

1,4,10,13-Tetraoxa-7,16-diazoniacyclooctadecane bis(hexafluorophosphate): PF₆^- acting as a pseudohalide

D. E. Janzen, M. E. Botros, G. P. Helton, D. G. VanDerveer and G. J. Grant

Abstract: In the crystal structure of the title compound, C₁₂H₂₈N₂O₄²⁺·2PF₆^-, the center of the diprotonated macrocycle 18N₂O₄-2H²⁺ (18N₂O₄-2H²⁺ is the 1,4,10,13-tetraoxa-7,16-diazoniacyclooctadecane dication) coincides with a crystallographic inversion center. The structure displays N-HF interactions between H atoms of the cationic N atoms of the macrocycle and the F atoms of the PF₆^- anions. The HF distances are in the range 2.15 (3)-2.42 (4) Å. The structure is nearly isostructural with the previously determined iodide salt, with PF₆^- acting as a pseudohalide anion.

Online 25 March 2006

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