Thermal phase behaviour of N-alkyl-N-methylpyrrolidinium and piperidinium bis(trifluoromethanesulfonyl)imide salts

W. A. Henderson, V. G. Young, W. Pearson, S. Passerini, H. C. De Long, P. C. Trulove

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The phases, ion crystal packing and thermal properties of the N-alkyl-N-methylpyrrolidinium and piperidinium bis(trifluoromethanesulfonyl) imide (PYR1RTFSI and PIP1RTFSI (subscript R ≤ 1 for methyl and = 2 for ethyl), respectively) salts are compared using powder and single-crystal x-ray diffraction (XRD) and differential scanning calorimetry (DSC). The crystal structure of PIP12TFSI has been determined at 123 K. The salt crystallizes in the triclinic space group with Z ≤ 8. Structural data are also reported for PYR11TFSI at 153 K and PIP 12TFSI at 223 K. PIP11TFSI has identical ion crystal packing to the analogous pyrrolidinium salt PYR11TFSI. Since increasing the cation alkyl chain length to propyl or butyl (R ≤ 3 or 4) reduces the melting point of the salts below room temperature, this study may provide valuable insight into why these pyrrolidinium and piperidinium salts form room-temperature ionic liquids.

Original languageEnglish (US)
Article number006
Pages (from-to)10377-10390
Number of pages14
JournalJournal of Physics Condensed Matter
Volume18
Issue number46
DOIs
StatePublished - Nov 22 2006

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