Synthetic Schemes and Nomenclature

PAMAM dendrimers can be used to template and stabilize reduced (zero valent) metal nanopartides in solution [22, 26]. A number of synthetic strategies to prepare dendrimer encapsulated nanopartides (DENs) are available. The primary routes are described here readers are directed to recent reviews for more thorough discussions of dendrimer mediated nanoparticle syntheses [14, 25]. 

DENs are typically named by the dendrimer from which they are prepared along with the metal dendrimer stoichiometry used in the nanopartide synthesis, e.g. G5-OH(Pt5o). With careful synthetic techniques, nanopartides with very narrow particle size distributions (1.3 0.3 nm) can be selectively prepared inside dendrimer interior cavities [14]. Provided that metal reoxidation is prevented, DENs are stable for long periods of time and do not agglomerate, since the nanopartides are trapped within the dendrimer framework [14, 25]. Further, this general synthetic methodology is quite flexible, having been used to prepare monometallic Pt, Au, Cu, Pd, and Ru nanopartides [14] as well as a number of bimetalUc systems (see below). 

Bimetallic DENs can be prepared using methodologies comparable to those for monometallic DENs. Important additional considerations are the interactions between metal salt precursors and the potential to control particle morphology 

PdAu Co-complex G6-Q116 allyl alcohol hydrogenation 32 

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