Abstract
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.