| Autor: |
Chong, Alison L., Zhu, Haijin, Nairn, Kate M., Forsyth, Maria, MacFarlane, Douglas R. |
| Zdroj: |
The Journal of Physical Chemistry - Part C; 20240101, Issue: Preprints |
| Abstrakt: |
Protic salts, including those showing plastic crystal behavior, are an interesting family of materials being rediscovered for use as solid conducting materials. This work compares two such compounds, 2-methylimidazolium triflate, [2-MeHIm][TfO], and 2-methylimidazolinium triflate, [2-MeHImn][TfO]. This subtle change in structure resulted in substantial differences in thermal behavior; [2-MeHIm][TfO] shows two solid–solid phase transitions while none were observed for [2-MeHImn][TfO]. However, both compounds are in a disordered solid state (ΔSf< 40 JK–1mol–1) resulting in relatively high room temperature conductivities. Neat [2-MeHImn][TfO] had a conductivity above 10–5S cm–1, but the addition of either the component acid or base as dopants resulted in a substantial increase in conductivity, to over 10–4S cm–1at 30 °C. Solid-state 1H and 19F NMR studies suggest that the dopants enhance the conduction primarily by increasing the proportion of mobile ions in the solid matrix. However, [2-MeHIm][TfO] also displays evidence of proton hopping via the cation. |
| Databáze: |
Supplemental Index |
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