Abstract
Triphenylene mesogens possessing fluorinated phenyl groups connected to the central triphenylene core with ester and ether linkages were compared on the mesomorphism. The results indicate that the fluorination of the peripheral phenyl groups arises strong intermolecular interactions among the peripheral parts to make the molecules stack easily to form a columnar structure. The thermal stability of the columnar mesophases is modified by the replacement of linkage group and the clearing temperature of Colh mesophase for the ester derivative is higher than that of the ether one. The carrier mobility evaluated by Time-Of-Flight (TOF) technique is shown to be in the order of 10−3 cm2 V−1 s−1 and 10−2 cm2 V−1 s−1 for the ester and ether derivatives, respectively.
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