Synthesis and characterization of novel imidazolium-based ionic discotic liquid crystals with a triphenylene moiety

Sandeep Kumar; Santanu Kumar Pal

doi:10.1016/j.tetlet.2005.02.100

Synthesis and characterization of novel imidazolium-based ionic discotic liquid crystals with a triphenylene moiety

Sandeep Kumar, Santanu Kumar Pal

Raman Research Institute

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

Two novel triphenylene-tethered imidazolium salts were synthesized either by the quaternization of 1-methylimidazole with an ω-bromo-substituted triphenylene or by the quaternization of a triphenylene-substituted imidazole with methyl iodide. Their chemical structures were determined by ¹H NMR, ¹³C NMR, IR, UV spectroscopy and elemental analysis. The thermotropic liquid crystalline properties of these salts were investigated by polarizing optical microscopy and differential scanning calorimetry. These triphenylene-based imidazolium salts with bromide or iodide as counterion show columnar mesophase properties over a wide temperature range.

Original language	English
Pages (from-to)	2607-2610
Number of pages	4
Journal	Tetrahedron Letters
Volume	46
Issue number	15
DOIs	https://doi.org/10.1016/j.tetlet.2005.02.100
State	Published - 11 Apr 2005
Externally published	Yes

Keywords

Columnar mesophase
Discotic liquid crystals
Imidazolium salts
Ionic liquid crystals
Triphenylene

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10.1016/j.tetlet.2005.02.100

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title = "Synthesis and characterization of novel imidazolium-based ionic discotic liquid crystals with a triphenylene moiety",

abstract = "Two novel triphenylene-tethered imidazolium salts were synthesized either by the quaternization of 1-methylimidazole with an ω-bromo-substituted triphenylene or by the quaternization of a triphenylene-substituted imidazole with methyl iodide. Their chemical structures were determined by 1H NMR, 13C NMR, IR, UV spectroscopy and elemental analysis. The thermotropic liquid crystalline properties of these salts were investigated by polarizing optical microscopy and differential scanning calorimetry. These triphenylene-based imidazolium salts with bromide or iodide as counterion show columnar mesophase properties over a wide temperature range.",

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AU - Pal, Santanu Kumar

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N2 - Two novel triphenylene-tethered imidazolium salts were synthesized either by the quaternization of 1-methylimidazole with an ω-bromo-substituted triphenylene or by the quaternization of a triphenylene-substituted imidazole with methyl iodide. Their chemical structures were determined by 1H NMR, 13C NMR, IR, UV spectroscopy and elemental analysis. The thermotropic liquid crystalline properties of these salts were investigated by polarizing optical microscopy and differential scanning calorimetry. These triphenylene-based imidazolium salts with bromide or iodide as counterion show columnar mesophase properties over a wide temperature range.

AB - Two novel triphenylene-tethered imidazolium salts were synthesized either by the quaternization of 1-methylimidazole with an ω-bromo-substituted triphenylene or by the quaternization of a triphenylene-substituted imidazole with methyl iodide. Their chemical structures were determined by 1H NMR, 13C NMR, IR, UV spectroscopy and elemental analysis. The thermotropic liquid crystalline properties of these salts were investigated by polarizing optical microscopy and differential scanning calorimetry. These triphenylene-based imidazolium salts with bromide or iodide as counterion show columnar mesophase properties over a wide temperature range.

KW - Columnar mesophase

KW - Discotic liquid crystals

KW - Imidazolium salts

KW - Ionic liquid crystals

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Synthesis and characterization of novel imidazolium-based ionic discotic liquid crystals with a triphenylene moiety

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