中文摘要：

选择噁二唑基团作为多枝化合物的“枝”，以苯甲腈基和咔唑基团为分子的“核”，合成了两个四枝化合物（BO-G2和NO-G2），进行了核磁共振和质谱的表征．从结构上看，BO-G2和NO-G2分别具有“D-A-A’-A-D”和“D＇-A-D-A-D’”电荷转移特征，后者具有pn结．吸收光谱和荧光光谱证实，NO-G2具有较大的激发态和基态偶极矩差值，存在着明显的分子内电荷转移和非线性吸收．

英文摘要：

Two new multibranehed ehromophores, named as NO-G2 and BO-G2, with the same peripheral branch of oxadiazole-unit, but different molecular core, that is, carbazole for NO-G2 and benzonitrile for BO-G2, were synthesized and characterized by mass spectra and ^1H NMR spectra, respectively. These two oxadiazole-based multibranched chromophores show the molecular architecture of ＂D-A-A＇ -A-D＂ for BO-G2 and＂D＇-A-D-A-D＇ ＂for NO-G2, which have the different ability of intramolecular charge transfer. The measured absorption and fluorescence spectra have shown that NO-G2 exhibits nonlinear absorption than BO-G2, owing to the former possessing pn junction and resultant more obvious intramolecular charge transfer.