We have established the electronic conduction in the nematic phase of a smallmolecule of a 2-phenylbenzothiazole derivative, i.e., 2-(40-octyloxyphenyl)-6-butoxybenzothiazole(8O-PBT-O4). This gives a new insight into the quest for theelectronic conduction in liquid crystals, which was initiated by Kusabayashiand Labes in late 1960s and had succeeded over several decades, leading it tothe end. In addition, it is clarified that the ionic conduction often observed in lessordered mesophases is induced with trace amounts of chemical impurities due toits low viscosity. The present result indicates that the charge carrier transport inthe mesophase is electronic in its intrinsic nature irrespective of mesophases andmolecular sizes, i.e., 1D-electronic conduction in columnar phase, 2D-electronicconduction in smectic mesophases, and 3D-electronic conduction in the nematicphase.
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