Tetraphenylethene derivatives not only exhibit âaggregation-induced emissionâ (AIE) effects, but also can form a mesophase with a turbine-like rigid core. Here we report the synthesis of three tetraphenyletheneâtriphenylene oligomers 7, 8E and 8Z by a CuSO4/sodium ascorbate catalyzed alkyneâazide cycloaddition reaction (CuAAC), and the successful separation of the cis- and trans-isomers by column chromatography. The structure and conformation of the oligomers were fully characterized. The photophysical properties were studied by using UV-vision and photoluminescent (PL) spectroscopy. The morphology of the aggregates was investigated by scanning electron microscopy (SEM), and the thermal stability and mesomorphic properties were investigated using thermal gravimetric analysis (TGA), polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The results revealed that the oligomers possess an AIE effect, but display no mesomorphism. However, 7 exhibits a hexagonal columnar mesophase when mixed with 2,4,7-trinitrofluorenone (TNF), forming a charge transfer complex.
四苯基
乙烯衍
生物不仅具有 "聚集诱导发射"(AIE)效应,还能形成具有涡轮状刚性内核的介相。在此,我们报告了通过CuSO4/
抗坏血酸钠催化的炔
吖啶环加成反应(Cu
AAC)合成了7、8E和8Z三种四亚苯基-三亚苯基低聚物,并通过柱色谱法成功分离了顺式异构体和反式异构体。低聚物的结构和构象得到了充分表征。利用紫外可见光和光致发光(PL)光谱对其光物理性质进行了研究。利用扫描电子显微镜(
SEM)研究了聚合体的形态,并利用热重力分析(TGA)、偏光光学显微镜(POM)、差示扫描量热仪(
DSC)和 X 射线衍射(XRD)研究了其热稳定性和介观性质。结果表明,这些低聚物具有 AIE 效应,但没有显示出介形性。然而,当 7 与
2,4,7-三硝基芴酮(TNF)混合并形成电荷转移复合物时,会显示出六角柱状介相。