The influence of chain-to-core coupling on the charge transport and mesomorphic properties of discotic materials

The charge carrier mobilities in discotic liquid crystalline materials cons isting of peripherally alkyl chain substituted triphenylene (T), phthalocya nine (Pc), and peri-hexabenzocoronene (HBC) cores have been measured using the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRM C). The use of more bulky coupling units joining the mesogenic alkyl chains to the core, e.g. sulphur or para-phenylene, results in charge transport a nd mesomorphic properties more favorable for device applications than the f requently used coupling via an oxygen atom.