ABSTRACT
Two new mesogenic compounds having a bicyclic aromatic thiazolo[5,4-d]thiazole linked to four 1,3,4-oxadiazol heterocycles were synthesised and their liquid-crystalline properties were investigated. The compounds exhibit enantiotropic hexagonal columnar mesophase with strong homeotropic orientation induced under confinement, and a wide mesophase range. The molecular packing is preserved at room temperature, especially the π-stacking inside the columns, which is essential for good charge carrier transport. They show high thermal stability, blue photoluminescence in solution, and blue-green in thin film. The morphology of spin-coated films is smooth even after thermal annealing, where large molecular-ordered domains were induced, but preserving the photoluminescence quantum yield. All characteristics suggest that this new class of mesogenic molecules is promising for technological applications.
Graphical abstract
![](/cms/asset/36419212-beee-4345-a4e4-3cce4f4b838d/tlct_a_1768602_uf0001_oc.jpg)
Acknowledgments
The authors thank to CNPq, CAPES/PROCAD, FAPESC, FACEPE, INCT/INEO, INCT-Catálise and INCT-INAMI for financial support. The XRD experiments were carried out in the Laboratório de Difração de Raios X (LDRX/UFSC). CEBIME carried out the mass spectrometry analysis.
Disclosure statement
The authors declare no conflict of interest.
Supplementary material
Supplemental data for this article can be accessed here.