萘修饰的树枝形聚酰胺-胺的合成与荧光性质研究

In this paper, different generations of amine terminated polyamidoamine dendrimers reacted with 1,8-naphthalic anhydride in DMF solvent. The dendrimers modified with peripheral 1,8-naphthalimide groups of 3.0 G and 5.0 G PAMAM were synthesized. The related products were named as D3 and D5, respectively and they were characterized by several instrumentations of FT-IR, UV-Vis, fluorophotometer and element analysis. The results showed that amidation reactions occurred between 1,8-naphthalic anhydride and PAMAM and the structures of the products were in accordance with the expectation. Because of the fixation of the naphthalin rings on PAMAM, the naphthalin of ground state and the naphthalin of excited state can form excimer. The study of fluorescent property indicated that a new peak emerges centered at 471 nm on the fluorescence emission spectra of D3 and D5 because of the excimer formation.