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利用再沉淀法制备了极性不同的两种基于Tr 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。
Two different Trutt’s base-based compounds were prepared by reprecipitation: 4,13-bis (4-biphenyl) -6,6,11,11-tetrabutyl-9H, 18H-8,17 (2,3-b: 2 ’, 3’-f) (1,5) diazocine (TBFB-BP) and 4,13- bis (4-N, N-diphenyl Aniline) -6,6,11,11-tetrabutyl-9H, 18H-8,17-methyldifluorene (2,3-b: 2 ’, 3’-f) (TBFB-TPA) organic nanocrystals. Due to the steric hindrance of the Λ-kink configuration, both compounds showed strong blue fluorescence under solution, nanoparticle suspension and solid powder. With the increase of the nanoparticle size, the absorption spectra of the TBFB-BP nanoparticle suspension are red-shifted and the emission spectrum is enhanced. This may be due to the increase of the nanoparticle size and the increase of the lattice rigidity of the nanoparticles, Relaxation reduced. However, for the more polar TBFB-TPA, its emission spectrum shifts blue gradually with increasing particle size due to the solvent effect. The effect of molecular polarity on the size effect is also discussed.