The salt N-ethyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR 12TFSI) undergoes several solid-solid phase transitions before melting at 91°C. At -120°C, the crystal structure consists of ordered ions (phase IV). After the solid-solid phase transition at -85°C, however, all of the PYR 12+ and TFSI - ions become disordered, forming a plastic crystalline phase (phase III). We report here the PYR 12TFSI phase III and IV structures determined from single-crystal diffraction data using the same crystal. The two structures are compared to elucidate the mechanism of the phase transition and gain a greater understanding of disordering modes of ions in the solid state. © 2006 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Chemistry
- Materials Science(all)
Henderson, W. A., Young Jr., V. G., Passerini, S., Trulove, P. C., & De Long, H. C. (2006). Plastic phase transitions in N-ethyl-N-methylpyrrolidinium Bis(trifluoromethanesulfonyl)imide. Chemistry of Materials, 18(4), 934 - 938. https://doi.org/10.1021/cm051936f