Hexasubstituted Triphenylenes : A New Mesomorphic Order

Abstract

We have prepared two series of hexasubstituted triphenylene derivatives : hexaethers from CH3 to C13H27 and hexaesters from C3H7 to C13H27. Most of them exhibit a thermotropic mesophase with a large temperature range. We have found the existence of an additional transition within the mesophase domain of some hexaesters with long alkyl chains. The structure of this new type of liquid crystal is discussed with respect to ours results concerning miscibilities and heat of transition

Columnar, Discotic Nematic and Lamellar Liquid Crystals: Their Structures and Physical Properties

“…Hexuhexylthiotriphenylene (2, R = SC,H, 3) This compound (HHTT) shows a transition from a hexagonal ordered phase (Dho) to a hexagonal disordered one (Dhd). As mentioned earlier, the former is a phase in which there is regularity in the stacking of the triphenylene cores in each column, and the latter one in which the column is liquidlike.…”

Anisotropic Change of Liquid‐Crystal Domains by Polarized Infrared Pulse Laser Irradiation for a Columnar Mesophase

“…[20] We found that, using an IR free-electron laser (FEL), the homeotropic The infrared photoinduced alignment change of liquid-crystal domains was investigated for a hexagonal columnar mesophase of a liquid-crystalline triphenylene derivative. A uniform and anisotropic alignment change of domains was observed when a polarized infrared (IR) light corresponding to the wavelength of the aromatic C±C stretching absorption band of the triphenylene core was used to irradiate the sample.…”

Sugar-Coated Discotic Liquid Crystals

“…It has been found that individual columns of molecules in columnar mesophases can act as molecular wires for the transport of charge [3,4] or excitons. [5,6] These unique properties of discotic LCs have led to predictions [7] of commercial applications in areas as disparate as environmental gas sensing and fast high-resolution light scanning to the building of hybrid computer chips.The discotic LC properties of n-alkoxytriphenylene derivatives [8] are amongst the most widely investigated of their kind. Symmetrically-functionalized triphenylene derivatives [8] are non-amphiphilic in nature and give exclusively thermotropic mesophases.…”

“…The discotic LC properties of n-alkoxytriphenylene derivatives [8] are amongst the most widely investigated of their kind. Symmetrically-functionalized triphenylene derivatives [8] are non-amphiphilic in nature and give exclusively thermotropic mesophases.…”

“…Symmetrically-functionalized triphenylene derivatives [8] are non-amphiphilic in nature and give exclusively thermotropic mesophases. Because of the archetypical position such triphenylenes occupy amongst discotic LCs, a large number of methods have been developed [9] to synthesize them.…”