Charge conduction in partially fluorinated discotic liquid crystals

Motivated by the role of electrostatic interactions on stacking of partially fluorinated conjugated compounds, we present mobility measurements of, e.g., 1,4-difluoro-2,3,6,7,10,11-hexakispentaloxytriphenylene (2F-HAT5) in discotic mesophases across a wide range of temperature and applied electric field. Charge conduction in this case is well described by a disorder driven hopping model. 2F-HAT5 exhibits a mobility of approximately 2x10$^{-3}$ cm$^{2}$/Vs, similar to the parent triphenylene, and has a weak temperature dependence throughout it's discotic mesophase, which extends below room temperature. We compare results on this and related compounds to various theoretical models.