Polyferrocene dendrimer

Finally, as discussed for linear polyferrocenes, dendrimers displaying more than a single multielectron oxidation have been found. This is the case of the complexes illustrated in Scheme 9.60... 

We briefly mention here the use of the ferrocene/ferrocenium redox couple to mediate electron transfer on the oxidation (anodic) side, especially in derivatized electrode. This broad area has been reviewed [349]. For instance, polymers and dendrimers containing ferrocene units have been used to derivatize electrodes and mediate electron transfer between a substrate and the anode. Recently, ferrocene dendrimers up to a theoretical number of 243 ferrocene units were synthesized, reversibly oxidized, and shown to make stable derivatized electrodes. Thus, these polyferrocene dendrimers behave as molecular batteries (Scheme 42). These modified electrodes are characterized by the identical potential for the anodic and cathodic peak in cyclic voltammetry and by a linear relationship between the sweep rate and the intensity [134, 135]. Electrodes modified with ferrocene dendrimers were shown to be efficient mediators [357-359]. For the sake of convenience, the redox process of a smaller ferrocene dendrimer is represented below. 

Ferrocene units have also proved popular for the construction of dendrimers with metal atoms throughout the structure. An example of the materials prepared is the polyferrocene dendrimer 245, which was synthesized by means of a hydro-silylation approach (Equation (89)). " Cyclic voltammetric studies of245 showed that the central and surrounding ferrocene units oxidize reversibly but at different potentials. Cyclopentadienyliron arene cations also provide broad possibilities as cores for dendrimer contruction, and dendrimers with electrocatalytic functions have been reported. ... 

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See also in sourсe #XX -- [ , ]

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