Abstract
Ionic liquids – ionic crystals – ionic liquid crystals? Structural order in imidazolium-based ILs, a series of asymmetrical 1-dodecyl-2-methyl-3-alkylimidazolium bromides, [C12C1Cnim][Br] with n = 0–12.
Highlights
Because of the lack of commercial availability of methyl bromide, the 1,2-dimethylimidazole has been alkylated at the N-3 position with a small excess of dodecylbromide to obtain 1-dodecyl-2,3-dimethylimidazolium (C12C1C1)
For the synthesis of compound C12C1C0, the protonation of the nitrogen has been realized by addition of hydrobromic acid (HBr) at low temperature
We have prepared a series of 1-dodecyl-2methyl-3-alkylimidazolium bromides of which the thermal behaviour has been investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and small angle X-ray scattering (SAXS) experiments
Summary
Compound C12C1C5 exhibits a cold crystallization from a smectic A phase at −30.1 °C during the first heating, followed by a solid–liquid crystalline transition (Cr → SmA) occurs at 4.8 °C. For both compounds, solid–solid transitions (Cr → Cr′) which involve at least for C12C1C11 two solid forms, can be observed preceding a solid–liquid crystalline transition (Cr′ → SmC) involving two LC states which could not be resolved (as indicated by the peak shape) (Fig. S65†) and a clearing point.
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