Room-Temperature Columnar Liquid Crystals from Twisted and Macrocyclic 9,9′-Bifluorenylidene Mesogen with Ambipolar Carrier Transport Properties
Jinjia Xu
Abstract
High Resolution Image Download MS PowerPoint Slide We herein report the synthesis and characterization of a series of twisted and conjugated 9,9′-bifluorenylidene ( BF ) derivatives and a ladder-shaped cyclic dimer ( CBF ) bearing eight long alkoxy chains at peripheral positions. These contorted aromatics formed hexagonal columnar liquid crystalline mesophases over a wide temperature range, including room temperature. Ambipolar carrier transport properties with electron and hole mobility values of approximately 10 –4 and 10 –5 cm 2 V –1 s –1, respectively, were achieved for the BF derivatives forming a monodomain orientation at ambient temperature.
Topics & Concepts
MesogenAmbipolar diffusionCrystallographyAlkoxy groupAtmospheric temperature rangeMaterials scienceConjugated systemDimerLiquid crystalHexagonal crystal systemLiquid crystallineStereochemistryChemistryElectronPolymerAlkylOrganic chemistryOptoelectronicsThermodynamicsComposite materialPhysicsQuantum mechanicsLiquid Crystal Research AdvancementsPorphyrin and Phthalocyanine ChemistryOrganic Electronics and Photovoltaics