Microwave-assisted synthesis of novel imidazolium-based ionic liquid crystalline dimers

Supramolecular Structures in the Presence of Ionic Liquids

“…The structure of imidazolium ionic LCs is much simplex, which makes its application in many fields confined. In order to resolve this problem, much effective effort has been made (Goossens et al, 2008;Kumar & Pal, 2005;Pal & Kumar, 2006;Seo et al, 2007;Yasuda et al, 2010;Yazaki et al, 2008b;Yazaki et al, 2010;Yoshio et al, 2004;Yoshio et al, 2006;Yoshio et al, 2007;Yoshizawa et al, 2004;Zhang et al, 2008d), especially the work of Kato and collaborators (Yasuda et al, 2010;Yazaki et al, 2008b;Yazaki et al, 2010;Yoshio et al, 2004;Yoshio et al, 2006;Yoshio et al, 2007). They observed the appearance of a hexagonal columnar LC structure in 1-methylimidazolium ILs with tri-alkoxy substituted phenyl groups, a class of LC mesogers, attached to the nitrogen atom Yoshio et al, 2006;Yoshio et al, 2007).…”

Ionic liquid crystals from β-diketonyl containing pyridinium cations and tetrachlorozincate anions

“…Tables SI7 and 1 display the transition temperatures and phase assignments of compounds I and II, respectively. The melting points of the chloride salts I (n = [10][11][12][13][14][15][16][17][18] are lower than the clearing temperatures for related N-alkylpyridinum chloride salts [12]. It suggests a reduced packing efficiency, which gives rise to lower melting points and a destabilization of the solid phases.…”

“…A recent review of ionic liquid crystals based on different organic salts has been reported by Binnemans [6]. In general terms, N-alkylimidazolium and N-alkylpyridinium salts are examples extensively described which give rise to ionic liquid crystals by increasing the alkyl chain of the cationic part [7][8][9][10][11][12][13][14][15].…”

“…A recent review of ionic liquid crystals based on different organic salts has been reported by Binnemans [6]. In general terms, N-alkylimidazolium and N-alkylpyridinium salts are examples extensively described which give rise to ionic liquid crystals by increasing the alkyl chain of the cationic part [7][8][9][10][11][12][13][14][15].Previous works from our lab have been directed towards the study of ionic metallomesogens based on long-chained 3-or 3,5-substituted pyrazole ligands, which were prepared from their corresponding intermediate 1-or 1,3-substituted b-diketones [16]. As extension, we are now interested in preparing new metallic salts as potential ionic liquid crystals.…”

Pyridinium-based ionic liquid crystals with terminal fluorinated pyrrolidine

“…In the recent years, the number of articles reporting ILCs has risen dramatically [12][13][14][15][16][17][18][19][20][21][22][23]. Some of these reported ILCs are shown in Scheme 1.…”