Plastic phase transitions in N-ethyl-N-methylpyrrolidinium Bis(trifluoromethanesulfonyl)imide

Wesley A. Henderson, Victor G. Young, Stefano Passerini, Paul C. Trulove, Hugh C. De Long

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)934-938
Number of pages5
JournalChemistry of Materials
Issue number4
StatePublished - Feb 21 2006


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