Dendrimers three-component system

The three components of the self-assembled structure have complementary properties so that new functions emerge from their assembly. Dendrimer 5 has a very high molar absorption coefficient in the UV spectral region because of 12 dimethoxybenzene and 16 naphthyl units, but it is unable to sensitize the emission of an Nd ion placed in its cyclam core. The [Ru(bpy)2(CN)2] complex can coordinate (by the cyanide ligands) and sensitize the emission of Nd ions. Self-assembly of the three species leads to a quite unusual Nd complex which exploits a dendrimer and an Ru complex as ligands. Such a system behaves as an antenna that can harvest UV to VIS light absorbed by both the... 

The supramolecular dendrimers and hyperbranched system considered in the previous section are assembled from identical dendrons and monomers that contain complementary noncovalent recognition motifs. In 1997, Zimmerman and coworkers produced a three-component dendrimer (36) whereby two dendrons (37) were brought together around a small dicationic core (38) by complementary electrostatic and hydrogen bonding interactions (Scheme 8). The ditopic core template is also a known pharmaceutical, pentamidine, which is active against Pneumocystis carinii pneumonia —a serious lung infection. Controlled disassembly of the dendrimer in vivo would result in increased... 

The controlled branching that diverges at each branch point in a stepwise polymerization results in a novel architecmre, which in three dimensions becomes globular. The term dendrimer reflects the tree-like hyperbranching that results when such a system is constructed so that the branches contain no linear components but diverge at each branch point (Frechet and Hawker, 1996, Frechet and Tomalia, 2001). This is shown in Figure 1.19 (Frechet and Hawker, 1996). 

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