Ideal and non-ideal behaviour of {1-butyl-1-methylpyrrolydinium bis(trifluoromethylsulfonyl)imide + γ-butyrolactone} binary mixtures

- Excess properties of ([bmpyrr][NTf2] + γ-butyrolactone) mixtures are reported.
- An ideal behaviour of the mixture was observed.
- Interactions in the mixtures are weaker comparing to pure IL and GBL.
- Calculated Angell's strength parameter indicates a “fragile” ionic liquid.
- [bmpyrr]+ forms micellar structures when xIL > 0.6.