Tris(5‐aryl‐1,3,4‐oxadiazolyl)benzotrithiophenes – Discotic Liquid Crystals with Enormous Mesophase Ranges

C3-symmetrical, alkoxyphenyl substituted 2,5,8-(tris-1,3,4-oxadiazol-2-yl)benzo [1,2-b; 3,4-b′; 5,6-b′′]trithiophenes (OXD-BTT) are synthesized via threefold Huisgen-reaction. A broad variation of alkoxy substitution pattern and chain lengths is reported. The thermal behavior was investigated differential scanning calorimetry (DSC), polarized optical microscopy (POM) thermogravimetry (TGA). Optical properties were studied UV-Vis fluorescence spectroscopy. Structural information the LC phases gained from X-ray diffraction on oriented fibers. OXD-BTT provide enormous phase widths (ΔT≥289 K) with clearing points close to decomposition. Most derivatives exhibit two different mesophases, lower a rectangular 3D-structure hexagonal 2D-lattice at higher temperature. length allows tuning melting points. emit blue light quantum yields up 30 % in good solvents. emission very sensitive aggregation, thus, poor solvents intensity decreases, red shift maxima occurs.