The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /PAMAM dendrimers, as well as reaction temperature strongly influence complexation between Ag+ and PAMAM dendrimers. The maximum complexing number of Ag+ that amino , hydroxyl and carboxylate terminated PAMAM dendrimers could bind has been obtained. It has been found that the measured value of amino and hydroxyl terminated PAMAM is almost similar to the theory value, but to carboxylate terminated PAMAM, there is a discrepancy between the measured value and theory value because of the electrostatic interaction between the silver ion and carboxyl group.
Because the redox potential of copper is low er,it is difficult to preparation well-stabilized copper cluster.Copper clust er which is well-stabilized,well-degree of dispersion,smaller in diameter,c an be obtained in presence of dendrimer as a template and hydrazine as a reducta nt under air.UV-Visible absorption and transmission electron microscopy are us ed to study the structure and property of copper cluster.The data show that the reduced Cu does not exist as isolated atoms,but rather as cluster.Change of t he pH value of solution great influences the particle size,dispersion and stabi lity.The results show that the solution at pH7.0±0.5,the stability and dispersion of the obtained copper cluster are too better.
