New liquid crystals derived from thiophene connected to the 1,2,4-oxadiazole heterocycle

ABSTRACT

In this study, eight new compounds derived from thiophene were synthesised and characterised. The four symmetrical compounds contain two heterocyclic 1,2,4- oxadiazole on each side of the 2,5-disubstituted thiophene, and the four non-symmetrical compounds contain alkyne groups as a spacer replacing one of these heterocycles. Some of the compounds presented liquid crystalline properties with smectic and nematic mesophases. The non-symmetrical compounds presented low emission of blue light.

GRAPHICAL ABSTRACT

KEYWORDS:

• 1,2,4-oxadiazole
• thiophene
• liquid crystal

Acknowledgements

The authors are grateful to the funding agencies: CNPq, CAPES, INCT/INEO, INCT-Catálise and PRONEX/FAPESC. The XRD experiments were carried out in the Laboratório de Difração de Raios X (LDRX-CFM/UFSC). CEBIME carried out the mass spectrometry analysis.

Disclosure statement

No potential conflict of interest was reported by the authors.

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Additional information

Funding

This work was supported by CNPq, CAPES, INCT/INEO, INCT-Catálise and PRONEX/FAPESC.