First examples of room-temperature discotic nematic liquid crystals exhibiting ambipolar charge carrier mobilities
Résumé
Four new room-temperature nematic liquid-crystalline (LC) dimers consisting of a wedge-shaped 3,4,5-tridecyloxy gallic ester molecule linked to either cyanobiphenyl, cholesteryl, pentaalkynylbenzene or triphenylene based moieties are reported. Dimers with pentaalkynylbenzene and triphenylene moieties in their room-temperature discotic nematic (ND) mesophase show ambipolar charge carrier mobilities of the order of 10−5 cm2 V−1 s−1 and 10−3 cm2 V−1 s−1, respectively, as measured using a time-of-flight (ToF) technique.