Structural studies of ambient temperature plastic crystal ion conductors

MacFarlane, D.R., Meakin, P., Amini, N. and Forsyth, M. 2001, Structural studies of ambient temperature plastic crystal ion conductors, Journal of physics : condensed matter, vol. 13, no. 36, pp. 8257-8267, doi: 10.1088/0953-8984/13/36/303.

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Title Structural studies of ambient temperature plastic crystal ion conductors
Author(s) MacFarlane, D.R.
Meakin, P.
Amini, N.
Forsyth, M.ORCID iD for Forsyth, M.
Journal name Journal of physics : condensed matter
Volume number 13
Issue number 36
Start page 8257
End page 8267
Total pages 11
Publisher Institute of Physics Publishing Ltd.
Place of publication Bristol, England
Publication date 2001-08-23
ISSN 0953-8984
Summary A number of novel organic ionic compounds based on the pyrrolidinium cation are described which have been found to be ion conductors in their solid states around room temperature. The properties of the compounds are consistent with their exhibiting plastic crystal phases. In order to understand some of the molecular origins of the plastic crystal behaviour and the ion conductivity that it promotes, a number of related compounds based on the imidazolium and ammonium cations are also described which have structural elements in common with the pyrrolidinium cation, but which do not show the plastic behaviour. It is found therefore that the nature of the cation is quite critical to the development of this behaviour. The alkyl methyl pyrrolidinium cation is found to produce plastic crystal phases when the alkyl chains are short, thereby preserving the ability of the cation to rotate with minimal steric hindrance. The ammonium and imidazolium cations of comparable size and structure are less able to produce these plastic phases, in many cases because the low temperature phase proceeds to melt rather than forming a stable rotator phase.
Language eng
DOI 10.1088/0953-8984/13/36/303
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
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