Ionic Liquid Crystals

Causin, Valerio; Saielli, Giacomo

doi:10.1007/978-94-007-2891-2_4

Cited by 21 publications

(23 citation statements)

References 119 publications

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“…For example, ion conduction is significantly enhanced in smectic A (SmA) and columnar phases as compared with the isotropic liquid phases. The unique properties of ILCs make them suitable for many technological applications including display technology, solar cells, ion conductors in batteries, and templates for the synthesis of nanomaterials [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. They are even considered as organized reaction media in which many organic reactions including Diels-Alder reactions; intramolecular Diels-Alder reactions can be performed with highly regio-and chemoselective reactions, with the additional advantage of being recycled [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts

et al. 2020

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A series of bis(4-alkoxyphenyl) viologen bis(triflimide) salts with alkoxy chains of different lengths were synthesized by the metathesis reaction of respective bis(4-alkoxyphenyl) viologen dichloride salts, which were in turn prepared from the reaction of Zincke salt with the corresponding 4-n-alkoxyanilines, with lithium triflimide in methanol. Their chemical structures were characterized by 1H and 13C nuclear magnetic resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry, polarizing optical microscopy, and variable temperature X-ray diffraction. Salts with short length alkoxy chains had crystal-to-liquid transitions. Salts of intermediate length alkoxy chains showed both crystal-to-smectic A (SmA) transitions, Tms, and SmA-to-isotropic transitions, Tis. Those with longer length of alkoxy chains had relatively low Tms at which they formed the SmA phases that persisted up to the decomposition at high temperatures. As expected, all of them had excellent thermal stabilities in the temperature range of 330–370 °C. Their light-emitting properties in methanol were also included.

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Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts

et al. 2020

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“…The field of ILCs is an active area of research for a decade or so that is manifested in a number of reviews on the topic. [19][20][21][22][23][24] They have the combined properties of both ionic liquids and liquid crystals. The LC phases offer great advantages over liquid phases.…”

Section: Introductionmentioning

confidence: 99%

Thermotropic liquid-crystalline properties of extended viologen bis(triflimide) salts

Bhowmik

Killarney

et al. 2017

Liquid Crystals

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A series of extended, symmetric viologen triflimides were synthesized by the metathesis reaction of lithium triflimide with the respective viologen tosyalates in methanol. Their chemical structures were characterized by Fourier Transform Infrared, 1 H and 13 C Nuclear Magnetic Resonance spectroscopy and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by a number of experimental techniques including differential scanning calorimetry, thermogravimetric analysis, polarizing optical microscopy and variable temperature X-ray diffraction. The viologen salts containing alkyl chain of two carbon and three carbon atoms were relatively low melting salts. Those of alkyl chains of four carbon and five carbon atoms formed ionic liquids at 88 and 42 °C, respectively. Those of alkyl chain of nine, ten and eleven carbon atoms were high melting salts as high as 166 °C. Those of higher alkyl chains of sixteen, eighteen and twenty carbon atoms showed thermotropic LC phases forming SmC, SmA and an unidentified smectic (Sm) phases, and showed SmA to isotropic transitions at high temperatures. As expected, all the viologen triflimides had excellent stabilities in the temperature range of 338-365 °C.

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“…Recently, their use in energy-related systems stemming from the unique properties of redox properties as well as LC properties of viologen moieties has given the boost for the exploration of this class of materials. Undoubtedly, this field is an active area of research for a decade or so that is manifested in a number of excellent reviews on this important topic [2,[25][26][27][28][29][30][31]. As a continuation of our research efforts in the ILCs, herein, we describe the synthesis of a series of symmetric viologen compounds with 4-n-alkylbenzenesulfonates (n = 6,7,8,9,10,12,14,16,18); wherein n denotes the carbon atoms in the alkyl chain), determine both their chemical structures by 1 H and 13 C NMR spectra-as well as elemental analysis-and the characterization of their thermotropic LC properties by several experimental techniques, including differential scanning calorimetry (DSC) and polarizing optical microscopy (POM).…”

Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates

et al. 2019

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A series of viologens containing 4-n-alkylbenzenesulfonates were synthesized by the metathesis reaction of 4-n-alkylbenzenesulfonic acids or sodium 4-n-alkylbezenesulfonates with the respective viologen dibromide in alcohols. Their chemical structures were characterized by Fourier Transform Infrared, 1H and 13C Nuclear Magnetic Resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry and polarizing optical microscopy. They formed LC phases above their melting transitions and showed isotropic transitions. As expected, all the viologen salts had excellent stabilities in the temperature range of 278–295 °C as determined by thermogravimetric analysis.

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Ionic Liquid Crystals

Cited by 21 publications

References 119 publications

Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts

Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts

Thermotropic liquid-crystalline properties of extended viologen bis(triflimide) salts

Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates

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