Chinese Journal of Organic Chemistry >
Synthesis and Properties of Thiadiazole Bent-Core Liquid Crystal with Difluorooxymethylene-Bridge
Received date: 2017-04-11
Revised date: 2017-07-06
Online published: 2017-10-11
Supported by
Project supported by the National Nutural Science Foundation of China (Nos. 11074054, 11374067).
Bent-core liquid crystal has attracted much attention because of its unique photoelectric performance. However, the bent-Core liquid crystal has been developed slowly because of its narrow temperature range and high phase transformation temperature. In this paper, a series of novel bent-core liquid crystal compounds were designed and synthesized, which were based on 2, 5-disubstitueted-1, 3, 4-thiadiazole as the central units, difluorooxymethylene (CF2O) as the linking group and straight alkyl as the terminal chain. The chemical structures of the target compounds were confirmed by IR, 1H NMR, 13C NMR, and 19F NMR. Then, their transition temperatures and phase textures were investigated by using differential scanning calorimetric (DSC) and polarizing optical microscopy (POM). The result suggested that all the target compounds exhibited nematic phase and existed wide temperature range of nematic phase, and the widest range of nematic phase was 92.74℃. Compared with the structure oxadiazole bend-core liquid crystal, the melting point is slightly higher and liquid crystal phase temperature range is wider, which could provide material and theoretical basis for the further design and synthesis of novel wide-temperature nematic phase bent-core liquid crystal.
Yin Junxia , Wen Yanhao , Mao Zhipeng , Zhang Zhiyong , Guan Jintao , Yan Daoren . Synthesis and Properties of Thiadiazole Bent-Core Liquid Crystal with Difluorooxymethylene-Bridge[J]. Chinese Journal of Organic Chemistry, 2018 , 38(2) : 471 -477 . DOI: 10.6023/cjoc201704016
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