Abstract
The synthesis and crystal structures of 1,3-diamino-2-methylimidazolium bis(trifluoromethylsulfonyl)imide (1), 1,3-dihydroxy-2-methylimidazolium bis(trifluoromethylsulfonyl)imide (2) and 1-(2-(diethylammonio)ethyl)-3-methylimidazolium bis(bis(trifluoromethylsulfonyl)imide) (4) are reported. The salts 1, 2 and 4 have melting points below 100 °C, the intermediate 1-(2-(diethylamino)ethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (3) is liquid at room temperature. Compound 1 is monoclinic, space group P21/n with a = 8.4979(4) Å, b = 12.2803(6) Å, c = 13.9400(7) Å, β = 93.086(4)°, and Z = 4. Compound 2 is monoclinic, space group P21/c with a = 7.6165(2) Å, b = 20.5323(8) Å, c = 9.7654(3) Å, β = 111.046(2)°, and Z = 4. Compound 4 is triclinic, space group \( P\overline{1} \) with a = 8.5313(4) Å, b = 9.2157(4) Å, c = 20.5812(8) Å, α = 84.668(2)°, β = 83.738(2)°, γ = 63.096(2)°, and Z = 2. The ions in 1 build a network of N–H···O hydrogen bonds, in 2 they are linked to chains by O–H···N and bifurcated O–H···O hydrogen bonds, whereas in 4 they form pairs by N–H···O contacts. The triflimide anions adopt transoid conformations.
Index Abstract
Short interionic contacts, conformational flexibility, and disorder phenomena were identified in the crystal structures of three new, low-melting, protic imidazolium triflimides.
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Bentivoglio, G., Schwärzler, A., Wurst, K. et al. Hydrogen Bonding in the Crystal Structures of New Imidazolium Triflimide Protic Ionic Liquids. J Chem Crystallogr 39, 662–668 (2009). https://doi.org/10.1007/s10870-009-9554-8
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DOI: https://doi.org/10.1007/s10870-009-9554-8