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• W4385296713 abstract "A series of 2,3-difluorophenylene-based negative liquid crystals which own different terminal groups has been synthesised in high yields through many classical named reactions such as Suzuki coupling and Williamson etherification. Thermal properties of these mesogens were tested by differential scanning calorimetry and the effects of the terminal groups on the melting points of molecules were evaluated. Dielectric anisotropies of the synthesised molecules were then measured and found that relatively long alkyl substituents would decrease the Δε value when compared with the ethyl. For the compound with a polar substitute on the long molecular axis, the introduction of 2,2-difluoroethyl would increase the negative Δε when it was put into the opposite direction of the original polar group, making this strategy a new access for the improvement of negative Δε. DFT calculations were carried out to analyse the orientation of the dipole moment in molecules and found that the introduction of 2,2-difluoroethyl had changed the orientation of the dipole moment into nearly perpendicular to the long molecular axis, which benefited the growth of the negative Δε value, revealing the mechanism of this strategy from the view of molecular level to some extent." @default.
• W4385296713 created "2023-07-28" @default.
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• W4385296713 date "2023-07-27" @default.
• W4385296713 modified "2023-10-18" @default.
• W4385296713 title "Increasing the negative dielectric anisotropy of liquid crystals with polar substituents parallel to their long molecular axis through adding terminal 2,2-difluoroethyl group" @default.
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• W4385296713 doi "https://doi.org/10.1080/02678292.2023.2238659" @default.
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