Synthesis And Properties Of The Naphthalimide Branches Function Of Luminescent Materials

The design and modification of the PAMAM dendrimers with fluorescent units could give new and interesting properties. We report the physical performance, luminescence properties and luminescence mechanism of the polyamidoamine dendrimer with peripheral 1,8-naphthalimide groups, synthesised with 1,8-naphthalic anhydride and amine terminated PAMAM dendrimer, with the lanthanide ions and hydrogen ions adding by absorption spectra , fluorescent spectra and so on.1,8-naphthalimide-labelled PAMAM includes many constitutional units of naphthalene in which the occurrence of electrons transition is easy to appear fluorescence. The dendrimer in chloroform/ethanol (1/1, V/V) diluent solution excited at 357 nm appears two fluorescence peaks, assigning to naphthyl monomer emission and intramolecular naphthyl- naphthyl dimmer/exmier emission. The presence of the lanthanide ions and hydrogen ions is found to have a very small effect on the naphthyl monomer emission peak but it has a disciplinarian effect on the intensity of the naphthyl-naphthyl dimmer/exmier emission peak. The enhancement in the fluorescence mainly owes to photoinduced electron transfer effect. The results obtained reveal the capacities of these systems to act as sensitive label agents of the Ianthanide ions and protons. The excitation spectrum of 1,8-naphthalimide-labelled PAMAM is one wide band from 250 to 400 nm and the emission spectrum is in the region of the blue ligh, the bluish violet light and the long wave ultraviolet light. And we can control the emission spectrum through changing conditions. The experiment results provide much important stuff for the research of the light conversion agriculture membrane.