A new ionic liquid crystal compound with viologen group in the principal structure

New 1,3-dioxane type ionic liquid crystal materials having a terminal double bond

“…Stilbazole type ionic LCs have also been reported [3][4][5]. Moreover, we have previously studied 1,3-dioxane , 1,3-oxathian e, and 1,3-dithian e type new LC materials [4][5][6][7][8][9][10][11][12][13][14][15][16][17], but ionic LC materials having these structures in their central core have not previously been encountered, although their possibilities are interesting. From this point of view, new LC compounds containing the 1,3-dioxan e structure were reported as a Communication [18].…”

Ambient temperature thermotropic liquid crystalline viologen bis(triflimide) salts

“…The compounds 1,1'-di (3,6,9-trioxatridecyl)-4,4'-bipyridinium dibromide and 1,1'-di (3,6,9,12-tetraoxatetradecyl)-4,4'-bipyridinium diiodide have LC properties from room temperature up to about 200 and 154 ‡C, respectively. 1,1'-Di(3,6,9-trioxatridecyl)-4,4'-bipyridinium diiodide, has a crystal-to-LC phase transition (T m ) at 63 ‡C and an LC-to-isotropic transition (T i ) at 216 ‡C [3,4].…”

“…In contrast, 1,1'-di (3,6,9-trioxadecyl)-4,4'-bipyridinium bis(tetrafluoroborate) and 1,1'-di (3,6,9-trioxadecyl)-4,4'-bipyridinium ditosylate are roomtemperature (RT) ionic liquids [5]. The 1,1'-diphenyl-4,4'-bipyridinium dialkylbenzenesulfonates that contain alkyl chains of length 10, 13, and 15 carbon atoms have T m values (205, 190 and 168 ‡C, respectively) above which each exhibits a SmA phase; the SmA phase for each then persists up to their decomposition temperatures (280-290 ‡C) [6]. Thus, it is evident that viologen compounds having suitably designed chemical architectures (dicationic salts), such as 1-alkyl-3-methylimidazolium, N-alkylpyridinium, and quaternary ammonium salts each of which is a monocationic salt [7][8][9], have great potential for the preparation of both RT ionic liquids (green solvents) and room temperature liquid crystalline (RTLC) ionic liquids (ordered reaction media).…”

“…They are an important class of compounds, which exhibit a number of interesting properties including electrical conductivity, photochromism, electrochromism, and thermochromism [1]. With suitably modified chemical architectures, they also exhibit thermotropic liquid crystalline (LC) properties [2][3][4][5][6]. For example, the thermotropic LC phase range for a series of these compounds with variation of alkyl chain lengths (n~5-10 and 18) and anions (X 2~C l 2 , Br 2 , I 2 , 2 BF 4 , 2 OOCCF 3 , 2 O 3 SCH 3 , and 2 OTs) are sensitive to both the alkyl chain length and the anion.…”

Synthesis of tetracationic organic salt from 4,4'-bipyridine

“…4,4'-bipyridine has a convenient structure to serve as a precursor for the synthesis of polycharged organic salts. Several reports appeared in literature describing the synthesis and applications of organic salts derived from 4,4'-bipyridine [3,[24][25][26][27][28][29]. In this regard, tetracationic salts derived from 4,4'-bipyridine have been reported using ethylbromide as primary quaternizing and X(CH 2 ) n X, n = 4-10 as spacers [30][31][32].…”