Dendrimer decanuclear

Schematic representations, like those shown in the Scheme 1, are very useful to indicate the chemical composition of the various species and to discuss the interaction between the various building blocks. Furthermore, as one can understand from the representations shown in Figures 9 and 10, the species with high nuclearity exhibit a ttu-ee-dimensional branching structure of the type of those shown by otherwise completely different dendrimers based on organic components. Therefore, endo- and exo-receptor properties can be expected, which are currently under investigation. Furthermore, aggregation of decanuclear complexes has also been demonstrated by dynamic light-scattering and conductivity experiments. Systematic studies on aggregation properties have, however, not been performed yet.

To illustrate the most interesting electrochemical features of this family of dendrimers, it is reported the results obtained for three strictly related decanuclear compounds and the highest nuclearity compound of this dendrimer family, that is, a docosanuclear complex. 

Figure 6.16 Redox patterns (differential pulse voltammetric peaks) for decanuclear den-drimers 22-24.61b 63 Peak Fc indicates the oxidation of ferrocene as an internal standard. The symbols used to represent the dendrimers are those displayed in Fig. 6.15.

Very interesting oxidation patterns have been obtained in MeCN for the series of decanuclear dendrimers shown in Fig. 6.16. 

An interesting series of polynuclear species of large nuclearity, which because of their shape can be called "dendrimers" or "arborols", has been obtained using Ru(II) and/or Os(II) as metal centers, 2,3-dpp and/or 2,5-dpp as bridging ligands, and bpy or 2,2 -biquinoline (biq) as terminal ligands (Fig. 2).23-34 structure of a decanuclear complex of this family is... 

In the early 1990 s, Balzani and coworkers began to synthesize decanuclear homo- and heterometallic dendrimers which contain Ru(II) and Os(II) surrounded by nitrogen-containing ligands (bpy derivatives). The metals occupied sites in both the dendrons and at the core of the... 

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