Plastic Phase Transitions in N-Ethyl-N-methylpyrrolidinium Bis(trifluoromethanesulfonyl)imide
Source abstract
Abstract
The salt N-ethyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR12TFSI) 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 PYR12 + and TFSI- ions become disordered, forming a plastic crystalline phase (phase III). We report here the PYR12TFSI 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.
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Research context
OpenAlex topics: Ionic liquids properties and applications · Crystallography and molecular interactions · Coordination Chemistry and Organometallics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, U.S. Naval Academy, 572 M. Holloway Road, Annapolis, Maryland 21402, X-ray Crystallographic Laboratory, Department of Chemistry, University of Minnesota, S146C Kolthoff Hall, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, ENEA, Casaccia Research Center, Via Anguillarese 301, 00060 Rome, Italy, and Air Force Office of Scientific Research, 4015 Wilson Boulevard, Arlington, Virginia 22203
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