The liquid crystallinity of the title compounds was studied in order to design a stable liquid crystal used at low temperature. The Schiff base derived from 1- or 3-fluoreneamine scarcely shows liquid crystallinity. The propionyl group is effective for lowering the melting point of the mesophase compared to the acetyl group in a series of the title substances. The liquid crystallinity of the title compounds was compared with that of biphenyl homologues. A mesophase of the title substances was observed over a wider range of temperatures than in the case of biphenyl derivatives in a series of propionyl groups.
为了设计一种可在低温下使用的稳定液晶,我们对标题化合物的液晶性进行了研究。由 1-或 3-
芴胺衍生的希夫碱几乎不显示液晶性。与一系列标题物质中的乙酰基相比,丙酰基能有效降低中间相的熔点。标题化合物的液态结晶度与
联苯同系物的液态结晶度进行了比较。与一系列丙酰基
联苯衍
生物相比,在更宽的温度范围内观察到了标题物质的介相。