Synthesis and characterization of ionic liquid crystals based on substituted pyridinium cations was written by Santos, Andreia F. M.;Cruz, Carlos;Godinho, Maria H.;Dionisio, Madalena;Figueirinhas, Joao L.;Branco, Luis C.. And the article was included in Liquid Crystals.Formula: C17H30BrN This article mentions the following:
Novel ionic liquid crystals based on pyridinium and methylpyridinium cations with a dodecyl chain and bromide as anion was prepared and characterized. [C12Pyr][Br] and [C12-n-Pic][Br] (n = 2, 3 or 4) were studied in order to understand the influence of the Me group position in the mesomorphic behavior. Neat microwave-assisted reactions were carried out to synthesized [C12Pyr][Br], [C12-3-Pic][Br] and [C12-4-Pic][Br] as a sustainable approach, leading to significantly reduced reaction times (35 min vs. 48 h in conventional method). All prepared compounds were characterized by spectroscopic techniques (1H and 13C-NMR; ATR-FTIR), Elemental Anal., 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. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Formula: C17H30BrN).
1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. Formula: C17H30BrN