| Different generatons of polyamidoamine dendrimers(PAMAM) with tri(2-aminoethyl)amine at the core were synthesized using divergent synthesis.The products were characterized by FTIR and 1H NMR.The results showed that the products synthesized had a precise molecular structure and the molecular structure was also correspond to the theoretical structure of the PAMAM dendrimers.The PAMAM possess a large number of primary amine groups,tertiary amine groups and amide groups,which can complex with Zn2+.In this paper,the complexation between PAMAM dendrimers and Zn2+ were studied by fluorescence spectrophotometry,and effects of the generation of PAMAM，molar ratio of Zn2+ to PAMAM,pH value of the solution,reaction temperature and reaction time on the complexation were discussed.The results showed that the number of complexed Zn2+ increased with the increase of generation of PAMAM and the experimental results were almost simlar to the theory value.As the molar ratio of Zn2+ to PAMAM increased,the complex forms cuold chang.The pH value of the solution also had a great effect on the complexation of PAMAM-Zn2+.The primary amine groups and tertiary amine groups of PAMAM were protonated under strong acidic conditions and Zn2+ was replaced by H+,resulting in the release of Zn2+.This phenomenon indicated that PAMAM dendrimers could be recycled.It was also found that the reaction temperature and reaction time could influence the complexation of Zn2+-PAMAM dendrimers.The reaction extent of complex system was enhanced with the increase of reaction temperature and reaction time. |