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Rotational and translational mobility of a highly plastic salt : Dimethylpyrrolidinium thiocyanate

journal contribution
posted on 15.02.2008, 00:00 authored by J Adebahr, M Grimsley, N Rocher, D MacFarlane, Maria ForsythMaria Forsyth
Thermal analysis, impedance spectroscopy, NMR and Raman spectroscopy have been used to investigate the plastic crystal dimethylpyrrolidinium thiocyanate in order to gain further insight into the properties of organic ionic plastic crystals. This compound has a solid–solid phase transition at 82 °C, and melts at 122 °C. A step increase in conductivity of about one order of magnitude is observed at the phase transition, followed by a decrease in activation energy for conduction. A large entropy gain occurs at the II → I transition, and 1H NMR linewidth measurements together with second moment calculations showed that the dimethylpyrrolidinium cation goes from a static state, to full isotropic tumbling. Raman measurements confirm that the cation as well as the anion exhibit increased rotational mobility when entering phase I.

History

Journal

Solid state ionics

Volume

178

Issue

35-36

Pagination

1798 - 1803

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0167-2738

eISSN

1872-7689

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2008, Elsevier B.V.