1. Columnar mesomorphism from a new luminescent thiazolo[5,4-d]thiazole-based core.
- Author
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de S. Santos, Arthur B., Girotto, Edivandro, Salla, Cristian A.M., Malvestiti, Ivani, Falcão, Eduardo H L, Bechtold, Ivan H., and Gallardo, Hugo
- Subjects
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THIAZOLES , *CHARGE carriers , *THERMAL stability , *BICYCLIC compounds , *PHOTOLUMINESCENCE , *THIN films - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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