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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Cruz, Carlos
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Publications (7/7 displayed)
- 2022Chiral 1D Metal-Organic Materials Based on Cu(II) and Amino Acid Schiff Basescitations
- 2022Synthesis and characterisation of ionic liquid crystals based on substituted pyridinium cationscitations
- 2021Study of magnetoelastic resonance for chemical sensors: Ribbons vs microwirescitations
- 2010Shear-induced lamellar ionic liquid-crystal foamcitations
- 2007Structure and molecular dynamics of the mesophases exhibited by an organosiloxane tetrapode with strong polar terminal groupscitations
- 2006Characterization by fourier transform infrared spectroscopy (FT-IR) and 2D IR correlation spectroscopy of PAMAM dendrimercitations
- 2002Anisotropic hydroxypropylcellulose films as alignment layers of a bistable ferroelectric devicecitations
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article
Synthesis and characterisation of ionic liquid crystals based on substituted pyridinium cations
Abstract
<p>Novel ionic liquid crystals based on pyridinium and methylpyridinium cations with a dodecyl chain and bromide as anion have been prepared and characterised. [C<sub>12</sub>Pyr][Br] and [C<sub>12</sub>-n-Pic][Br] (n = 2, 3 or 4) were studied in order to understand the influence of the methyl group position in the mesomorphic behaviour. Neat microwave-assisted reactions were carried out to synthesised [C<sub>12</sub>Pyr][Br], [C<sub>12</sub>-3-Pic][Br] and [C<sub>12</sub>-4-Pic][Br] as a sustainable approach, leading to significantly reduced reaction times (35 min vs. 48 h in conventional method). All prepared compounds were characterised by spectroscopic techniques (<sup>1</sup>H and <sup>13</sup>C-NMR; ATR-FTIR), Elemental Analysis, Differential Scanning Calorimetry (DSC), Polarised Optical Microscopy (POM) and X-Ray Powder Diffraction (XRD). It was observed that the presence of water highly influences the phase transformations. Nevertheless, thermotropic smectic phases were detected for all materials with a layer spacing between 20 and 35 Å, compatible with a bilayer interdigitated or tilted lamellar arrangement of the cation’s alkyl chain. This work also indicates new routes for preparing ionic liquid crystals with various functionalities ruled by the synthesis design.</p>