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Liquid Crystals Volume 49, 2022 - Issue 13
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Article

New multi-fluorinated benzofuran liquid crystals with large dielectric anisotropy and improved solubility

Jian Lia Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaCorrespondence[email protected]
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Lingchao Moa Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaView further author information
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Zhaoyi Chea Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaView further author information
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Juanli Lia Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaView further author information
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Minggang Hua Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaView further author information
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Danyang Wana Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaView further author information
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Zhongwei Ana Xi’an Key Laboratory of Liquid Crystals and Organic Photovoltaic Materials, Xi’an, P. R. China;b State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an, P. R. China;c Optical and Electrical Material Center, Xi’an Modern Chemistry Research Institute, Xi’an, P. R. ChinaView further author information
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Pages 1753-1762 | Received 30 Jan 2022, Accepted 29 Mar 2022, Published online: 14 Apr 2022
 
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ABSTRACT

Multi-fluorinated liquid crystal compounds with benzofuran core were synthesised and their structures were identified using 1 H NMR, 13 C NMR and mass spectra. Thermal analysis shows that further fluorination of the central benzene leads to a significant decrease in melting point and broadening of the nematic temperature range. Physical property test reveals that the compounds with tetrafluoro substituent have large dielectric anisotropy, high birefringence, and improved solubility in the host mixtures. The optimal geometry, polarisability and dipole moment of liquid crystal molecules were calculated by density functional theory, and the experimental results are explained. The new compounds show an excellent application of prospects in liquid crystal display.

GRAPHICAL ABSTRACT

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is supported by the Key Research and Development Program of Shaanxi [Program No. 2019ZDLGY04-06, 2020GY-272, 2021GY-228].

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