Water-soluble supramolecular assemblies of redox-active ferrocenyl-decorated (Fc) poly(propylene imine)(PPI) dendrimers and
-cyclodextrin (
CD) were adsorbed at self-assembled monolayers (SAMs) of
CD("molecular printboards"). The dendrimers form a stable monolayer at the
CD SAM owing to multivalenthost-guest interactions. In the present study, dendrimers of generation 1 (4 Fc end groups) up to generation5 (64 Fc end groups) were investigated. The immobilization of the dendrimers at the
CD SAM can be underelectrochemical control since Fc forms stable inclusion complexes with
CD, whereas the oxidized ferrocenium(Fc
+) does not. The redox-dependent adsorption process was studied by potential-dependent electrochemicalimpedance spectroscopy (EIS) and cyclic voltammetry (CV). Detailed information was obtained on theadsorption and desorption kinetics, the diffusion constants, and the conformation of the guest dendrimersadsorbed at the host surface.
