Multinuclear NMR studies on translational and rotational motion for two ionic liquids composed of BF4 anion.

Two ionic liquids (ILs) based on the BF(4)(-) anion are studied by (1)H, (11)B, and (19)F NMR spectroscopy by measuring self-diffusion coefficients (D) and spin-lattice relaxation times (T(1)). The cations are 1-ethyl-3-methylimidazolium (EMIm) and 1-butyl-3-methylimidazolium (BMIm). Since two NMR nuclei ((11)B and (19)F) of BF(4)(-) exhibit narrow lines and high sensitivity, the (11)B and (19)F NMR measurements of D(BF4) and T(1)(BF(4)) were performed in a wide temperature range.