Nematic Triphenyltriazine Triesters and the Induction of the Columnar Mesophase by Fluorine Substitution

Whereas their para homologs are not mesogenic, the disk-shaped triphenyltriazine meta-trialkylesters obtained via trimerization of 3-cyanobenzoic alkylester, which configurationally more flexible, exhibit a monotropic nematic mesophase. Introduction fluorine atoms into alkyl chains or phenyl moieties leads to appearance an enantiotropic columnar If is introduced both in and moieties, only mesophase remains. Fluorination either aromatic core, but both, appears thus as simple means inducing stabilizing self-assembly systems. As homeotropically alignable can be made persist at room temperature, energies higher than 3 eV first excited triplet state computed agreement with value reported for parent arene, they fluorescent themselves, these compounds promise aligning host matrices blue-emitting TADF devices improved light outcoupling. Dilution nonmesogenic homolog induces state, indicating that nanoscopic make-up mesophases closely related.