Acta Crystallographica Section C

Crystal Structure Communications

Volume 65, Part 5 (May 2009)

organic compounds

Acta Cryst. (2009). C65, o226-o228 [ doi:10.1107/S0108270109005277 ]

N,N'-Dimethylpyrazinediium bis(tetrafluoroborate) and N,N'-diethylpyrazinediium bis(tetrafluoroborate): new examples of anion- triads

J. Lu, A. S. Jalilov and J. K. Kochi

Abstract: Crystallization of N,N'-dimethylpyrazinediium bis(tetrafluoroborate), C₆H₁₀N₂²⁺·2BF₄^-, (I), and N,N'-diethylpyrazinediium bis(tetrafluoroborate), C₈H₁₄N₂²⁺·2BF₄^-, (II), from dried acetonitrile under argon protection has permitted their single-crystal studies. In both crystal structures, the pyrazinediium dications are located about an inversion center (located at the ring center) and each pyrazinediium aromatic ring is [pi] -bonded to two centrosymmetrically related BF₄^- anions. Strong anion- [pi] interactions, as well as weak C-HF hydrogen bonds, between BF₄^- and pyrazinediium ions are present in both salts.

Formula: C₆H₁₀N₂²⁺·2BF₄^- and C₈H₁₄N₂²⁺·2BF₄^-


	Structure factor file (CIF format) (79.7 kbytes) [ doi:10.1107/S0108270109005277/gg3186Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (98.4 kbytes) [ doi:10.1107/S0108270109005277/gg3186IIsup3.hkl ] Contains datablock II

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