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Liquid Crystals
Year: 2010  |  Volume: 37  |  Issue: 3  |  Page No.: 317 - 324

Helical twisting behaviour of new chiral dopants with (S)-1, 2-propanediol units for nematic liquid crystals

Hai quan Zhang, Wen ke Liu, An lei Qin, Fei fei Wang, Li cheng Zhao, Shuai Zhang, Ying Li and Huai Yang    

Abstract: A novel series of chiral dopants synthesised from (S)-1, 2-propanediol and mesogenic carboxylic acids were characterised by Fourier transform infrared and 1H nuclear magnetic resonance, and their helical twisting properties were investigated by doping the chiral dopants into a nematic liquid crystal host (SLC-1717). The results showed that the values of the molecular twisting power β were significantly dependent on the nature of the terminal substituents, terminal alkyl length and numbers of chiral centres in the molecular structure. Compared to compounds with electron-with-drawing groups (-NO2, -F, -CF3), the chiral compounds with terminal alkyl chains exhibited a higher β.

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