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.
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.
出处
《感光科学与光化学》
EI
CSCD
2007年第3期176-182,共7页
Photographic Science and Photochemistry
基金
国家自然科学基金(50273024
50673070)
关键词
含噁二唑四枝化合物
PN结
分子内电荷转移
非线性吸收
oxadiazole-based multibranched compounds
pn junction
intramolecular charge transfer
nonlinear absorption
