N-methyl-N-alkylpyrrolidinium hexafluorophosphate salts : novel molten salts and plastic crystal phases

Goldingm, J., Hamid, N., MacFarlane, D. R., Forsyth, M., Forsyth, C., Collins, C. and Huang, J. 2001, N-methyl-N-alkylpyrrolidinium hexafluorophosphate salts : novel molten salts and plastic crystal phases, Chemistry of materials, vol. 13, no. 2, pp. 558-564.

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Title N-methyl-N-alkylpyrrolidinium hexafluorophosphate salts : novel molten salts and plastic crystal phases
Formatted title N-methyl-N-alkylpyrrolidinium hexafluorophosphate salts : novel molten salts and plastic crystal phases
Author(s) Goldingm, J.
Hamid, N.
MacFarlane, D. R.
Forsyth, M.
Forsyth, C.
Collins, C.
Huang, J.
Journal name Chemistry of materials
Volume number 13
Issue number 2
Start page 558
End page 564
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2001-02
ISSN 0897-4756
1520-5002
Summary A new series of salts, based on the N-methyl-N-alkylpyrrolidinium cation and the PF6- anion, are reported and their thermal properties described for alkyl = Me, Et, Pr, Bu, Hx, and Hp. X-ray structures of several of the salts are also reported. The N,N-dimethylpyrrolidinium hexafluorophosphate has a melting point greater than 390 °C; however, the N-methyl-N-butylpyrrolidinium derivative melts at 70 °C. Most of the PF6- salts were observed to have lower melting points in comparison with the analogous iodide salts. Most of the salts exhibit one or more thermal transitions prior to melting and a final entropy of melting less than 20 J K-1 mol-1, behavior which has previously been associated with the formation of plastic crystal phases. Good crystal structure solutions were obtained at low temperatures in the case of the alkyl = propyl and heptyl derivatives. The loss of diffraction peaks and changes in symmetry at higher temperatures indicated the presence of dynamic rotational disorder, supporting the understanding that the plastic properties arise from rotational motions in the crystal.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2001, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030161

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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