End-group effects of piezofluorochromic aggregation-induced enhanced emission compounds containing distyrylanthracene
作者:Xiqi Zhang、Zhenguo Chi、Bingjia Xu、Chengjian Chen、Xie Zhou、Yi Zhang、Siwei Liu、Jiarui Xu
DOI:10.1039/c2jm33140c
日期:——
Distyrylanthracene derivatives, AnP3 and AnP3P with triphenylethylene end-groups, and AnP4 and AnP4P with tetraphenylethylene end-groups, were synthesized and characterized using nuclear magnetic resonance, mass spectrometry, elemental analysis, photoluminescence, ultraviolet-visible absorption, wide-angle X-ray diffraction, differential scanning calorimetry and other techniques. The results show that the piezofluorochromic properties of these four aggregation-induced enhanced emission (AIEE) compounds were influenced significantly by the structures of the end-groups in the molecules. The AnP4 and AnP4P derivatives with tetraphenylethylene end-groups exhibited distinct piezofluorochromic properties, which might be switched reversibly upon pressing or annealing because of crystalline-amorphous phase transformation. Thus, we propose that those AIEE compounds that contain steric hindrance groups may exhibit evident piezofluorochromic activities.
二碳炔基并四苯并蒽衍生物,AnP3和AnP3P末端基团为三苯乙烯,AnP4和AnP4P末端基团为四苯乙烯,通过核磁共振、质谱、元素分析、光致发光、紫外-可见光谱、广角X射线衍射、差示扫描量热等多种分析手段进行了合成和表征。结果表明,这四种聚集诱导发光(AIEE)化合物的压致变色性能显著受到分子末端基团结构的影响。四苯乙烯末端基团的AnP4和AnP4P衍生物展现出明显的压致变色性能,可能是由于结晶-无定形相变,在挤压或退火条件下可以可逆切换。因此,我们提出包含空间位阻基团的AIEE化合物可能表现出显著的压致变色活性。