Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 9 (September 2008)

organic compounds

 

Imidazolium-based ionic liquid salts: 3,3'-dimethyl-1,1'-(1,4-phenylenedimethylene)diimidazolium bis(tetrafluoroborate) and 3,3'-di-n-butyl-1,1'-(1,4-phenylenedimethylene)diimidazolium bis(trifluoromethanesulfonate)

K. Ganesan, Y. Alias and S. W. Ng

Abstract: Crystallization of the ionic liquid 3,3'-dimethyl-1,1'-(1,4-phenylenedimethylene)diimidazolium bis(tetrafluoroborate), C₁₆H₂₀N₄²⁺·2BF₄^-, (I), from its solution in water has permitted the first single-crystal study of an imidazolium-based ionic liquid having a tetrafluoroborate ion as counter-ion. Despite the expectation that the anion would not participate in nonclassical hydrogen bonding, the ionic liquid features C-HF hydrogen bonds. The dication lies about a center of inversion. The ionic liquid 3,3'-di-n-butyl-1,1'-(1,4-phenylenedimethylene)diimidazolium bis(trifluoromethanesulfonate), C₂₂H₃₂N₄²⁺·2CF₃SO₃^-, (II), features both C-HF and C-HO hydrogen bonds.

Formula: C₁₆H₂₀N₄²⁺·2BF₄^- and C₂₂H₃₂N₄²⁺·2CF₃SO₃^-

	Structure factor file (CIF format) (109.7 kbytes) [ doi:10.1107/S0108270108023111/sk3257Isup2.hkl ] Contains datablock I
	Structure factor file (CIF format) (324.7 kbytes) [ doi:10.1107/S0108270108023111/sk3257IIsup3.hkl ] Contains datablock II

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