利用再沉淀法制备了极性不同的两种基于Tr(o)ger's碱的化合物:4,13-二(4-联苯)-6,6,11,11-四丁基-9H,18H-8,17-甲基二芴(2,3-b:2',3'-f)(1,5)二氮芳辛(TBFB-BP)和4,13-二(4-N,N-二苯基苯胺)-6,6,11,11-四丁基-9H,18H-8,17-甲基二芴(2,3-b:2',3'-f)(1,5)二氮芳(TBFB-TPA) 的有机纳米晶.由于Λ-扭折构型的空间位阻作用,这两种化合物在溶液、纳米粒子悬浊液和固态粉末下均显示出强蓝色荧光. 随着化合物纳米粒径的增加,TBFB-BP纳米粒子悬浊液的吸收光谱红移,发射光谱增强,这可能是由于随着纳米粒径的增加,纳米粒子的晶格刚性增强,使其振动驰豫降低.但是对于极性更强的TBFB-TPA来说,由于溶剂效应,其发射光谱随着粒径的增大逐渐蓝移.此外还讨论了分子极性对尺寸效应的影响.
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