Columnar mesomorphism from a new luminescent thiazolo[5,4-d]thiazole-based core
- 26 January 2021
- journal article
- research article
- Published by Informa UK Limited in Liquid Crystals
- Vol. 48 (2), 182-189
- https://doi.org/10.1080/02678292.2020.1768602
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 pi-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.Keywords
Funding Information
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (431505/2016-0, 444061/2018-5, 303763/2018-3)
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