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本文设计并合成了一系列盘-棒-盘状液晶三聚体.此类三聚体由两个相同的苯并菲盘状介晶基元和一个联苯棒状介晶基元通过CuI-NEt3体系催化端基炔和端基叠氮化合物的点击反应连接形成.该三聚体结构通过核磁、红外和高分辨质谱表征;介晶性通过偏光显微镜(POM)、差示扫描量热法(DSC)和X射线衍射(XRD)进行了研究.结果显示:此类液晶三聚体均为室温液晶,呈现四方柱状相(Colr).连接3个介晶基元的柔性间隔基的长度对化合物的相转变温度具有明显影响.
In this paper, a series of disk-rod-disky liquid crystal trimers were designed and synthesized.These trimers consisted of two identical triphenylene disk-like mesogens and a biphenyl rod-like mesogen via CuI-NEt3 The system catalyzes the formation of a click reaction between the terminal alkyne and the terminal azide, which is characterized by NMR, IR and high resolution mass spectrometry (MMA). The mesomorphism is characterized by POM, DSC ) And X-ray diffraction (XRD). The results show that all of these liquid crystal trimers are room-temperature liquid crystals with tetragonal phase (Colr). The length of the flexible spacer linking the three mesogen Phase transition temperature has a significant effect.