An Electric‐Field‐Responsive Discotic Liquid‐Crystalline Hexa‐peri‐Hexabenzocoronene/Oligothiophene Hybrid

Abstract

A novel hexa-peri-hexabenzocoronene/oligothiophene hybrid is shown to self-assemble into a hexagonal columnar liquid crystalline phase, and respond to applied electric fields resulting in uniform homeotropic or parallel alignment depending upon the electrode structure. Furthermore, the columnar orientation can be maintained even after removal of the electric field unless the material is heated above the clearing temperature.

Functional Liquid Crystals towards the Next Generation of Materials

“…These order-order and order-disorder transitions are important for the functionalization of liquid crystals. [4,6,71] Forthermotropic liquid crystals, transitions are mainly triggered by increasing or decreasing the temperature.I na ddition to such thermal stimuli, photo [72][73][74][75][76] and mechanical stimulation, [6,[77][78][79][80][81][82][83][84][85][86] and electric fields [87][88][89][90][91][92][93][94][95][96] have been found to induce phase transitions.…”

“…[87] Columnar liquid crystals can also be oriented under electric fields. [88,89] Thea lignment of one-dimensional columnar LC assemblies is desirable to explore transporting materials. [90] Propylenecarbonate-based columnar liquid crystals complexed with lithium salts can be homeotropically aligned by the application of electric fields.…”

Self-assembled 1D Semiconductors: Liquid Crystalline Columnar Phase

“…As a molecular design strategy, Miyajima et al introduced aromatic amides with branched paraffinic tails onto mesogenic discotic cores such as corannulene, triphenylene and hexaphenylbenzene to serve as an electric-fieldresponsive handle that enables large-area unidirectional orientation of columnarly assembled LC molecules [136]. Very recently, a novel hexa-peri-hexabenzocoronene/oligothiophene hybrid DLC was shown to self-assemble into a hexagonal columnar LC phase, and respond to applied electric fields resulting in uniform homeotropic or planar alignment depending upon the electrode structure [137]. Furthermore, the columnar orientation was maintained even after removal of the electric field until the material was heated above the clearing temperature.…”

Von funktionellen Flüssigkristallen zur nächsten Generation von Materialien

“…Bei thermotropen Flüssigkristallen werden die Phasenübergänge hauptsächlich durch Erwärmen oder Abkühlen ausgelöst. Außer solchen thermischen Stimuli können auch Licht, mechanische Stimuli und elektrische Felder Phasenübergänge induzieren.…”