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Dendrimer is highly ordered branched poly-amidoamine macromolecule with tree-like topology and is used in the preparation of nanomaterial. Dendrimers have multiple coordination sites that are utilized to coordinate metal ions and synthesize metal clusters. In this method, metal ions in solution are complexed to dendrimer, mostly with amine groups in the outer shell of OH-terminated poly-amidoamine. Complexed metal ions are subsequently reduced to metal atoms which agglomerate into metal particle. Men et al. (2006) [10] reported the synthesis of dendritic polyphenylazomethines (DPA) dendron-encapsulated gold clusters having average cluster diameter of 2.2 nm (Figure 3.2).

Figure 3.2 Gold clusters with DPA dendron.