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Structure and dynamics in an organic ionic plastic crystal, N-ethyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl) amide, mixed with a sodium salt

Forsyth, Maria, Chimdi, Tarekegn, Seeber, Aaron, Gunzelmann, Daniel and Howlett, Patrick C. 2014, Structure and dynamics in an organic ionic plastic crystal, N-ethyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl) amide, mixed with a sodium salt, Journal of materials chemistry A, vol. 2, no. 11, pp. 3993-4003.

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Title Structure and dynamics in an organic ionic plastic crystal, N-ethyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl) amide, mixed with a sodium salt
Author(s) Forsyth, Maria
Chimdi, Tarekegn
Seeber, Aaron
Gunzelmann, Daniel
Howlett, Patrick C.
Journal name Journal of materials chemistry A
Volume number 2
Issue number 11
Start page 3993
End page 4003
Total pages 11
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2014
ISSN 2050-7496
Summary We present for the first time, the solid state phase behaviour of the organic ionic plastic crystal (OIPC) N-methyl-N-ethyl-pyrrolidinium bis(trifluoromethanesulfonyl)amide, [C2mpyr][NTf2], upon mixing with the sodium salt, Na[NTf2]. Whereas the behaviour of OIPCs mixed with lithium salts has been well established, the influence of adding a sodium salt has not previously been reported. The phase diagram is presented for Na[NTf2] compositions between 1 and 50 mol%, and shows a eutectic composition at 15 mol% with a eutectic temperature at 63 °C. In contrast to the lithium doping of the same OIPC, the conductivity does not increase significantly at, or below room temperature, however the material containing 40 mol% Na[NTf2] has an ionic conductivity of 10−4 S cm−1 in the solid state at 60 °C, which is more than 3 orders of magnitude higher than the pure OIPC. Synchrotron XRD, solid-state NMR and SEM all indicate the presence of two distinct phases across all of the compositions studied. One phase is identical to that of the pure [C2mpyr][NTf2] and the other phase is a mixed cation compound, quite distinct from the pure Na[NTf2] material. The higher eutectic temperature (63 °C) in the sodium based system compared to lithium (30 °C) leads to purely solid state conductivity over the entire composition range up to 63 °C.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30064313

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.