Received 3 December 2011
In the title compound, CH3NH3+·BF4-·C12H24O6, the methylammonium cation makes three N-HO hydrogen bonds to the 18-crown-6 molecule. The -NH3+ and -CH3 groups of the cation adopt a staggered conformation. The F atoms of the tetrafluoridoborate anion are disordered over two sets of sites in a 0.519 (11):0.481 (11) ratio. Weak C-HF interactions occur in the crystal, which possibly correlate with the anion disorder.
Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6552 ).
The author thanks Southeast University for support.
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