New liquid crystals derived from thiophene connected to the 1,2,3-triazole heterocycle

Abstract

In this work, six new compound derivatives from thiophene were synthesised. The three symmetrical compounds were synthesised containing two heterocyclic 1,2,3-triazole on each side of thiophene, 2,5-disubstituted and the three non-symmetrical compounds were synthesised containing alkyne groups as a spacer in replacing one of these heterocycles. The structural modifications were made by changing the number of alkoxy groups in order to understand the relation between structure and mesomorphic behaviour. Some of the compounds presented liquid crystalline properties, smectic and nematic mesophases. The non-symmetrical compounds allowed for a low emission in the blue region.

Keywords:

• non-symmetrical compounds
• terminal substituents
• triple bond unit as spacer
• XRD experiments
• fluorescence quantum yields

Acknowledgements

The XRD experiments were carried out in the Laboratório de Difração de Raios X (LDRX-CFM/UFSC). Thanks to CEBIME for the mass spectrometry analysis.

Additional information

Funding

The authors are grateful to the following financial agencies: CNPq, CAPES, INCT/INEO, INCT-Catálise and PRONEX/FAPESC.