High birefringence and large negative dielectric anisotropy phenyl‐tolane liquid crystals |
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Authors: | Haiqing Xianyu Sebastian Gauza Qiong Song Shin‐Tson Wu |
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Institution: | College of Optics and Photonics , University of Central Florida , Orlando, FL 32816 |
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Abstract: | Two phenyl‐tolane compounds with two pairs of (2,3) lateral difluoro substitutions were synthesized and their properties evaluated. These compounds exhibit a high birefringence (Δn ~ 0.35) and a large negative dielectric anisotropy (Δε~ ?8). These two important features make the phenyl‐tolane compounds useful as a dopant in a negative Δε liquid‐crystal mixture to enhance the performance of the host mixture, or as a negative component in a dual‐frequency liquid‐crystal mixture to improve the dielectric anisotropy and birefringence and lower the crossover frequency. |
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