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Ferrocenyl Dendrimers Based on Octasilsesquioxane Cores

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journal contribution
posted on 10.09.2012, 00:00 by Marta Herrero, Beatriz Alonso, José Losada, Pilar Garcı́a-Armada, Carmen M. Casado
Hydrosilylation reactions of two octasilsesquioxane dendritic cores containing terminal vinyl groups with bis­(ferrocenyl)­methylsilane (1) give dendrimers functionalized with 16 (G1-Fc16) and 32 (G2-Fc32) interacting ferrocenyl units. Characterization of the dendrimers by 1H, 13C­{1H}, and 29Si­{1H} NMR spectroscopy as well as mass spectrometry supports their assigned structures. The thermal behavior of dendrimers G1-Fc16 and G2-Fc32 was studied by TGA techniques. The redox activity of the ferrocenyl centers in G1-Fc16 and G2-Fc32 has been characterized by cyclic voltammetry and square wave voltammetry in dichloromethane containing [n-Bu4N]­[PF6] as electrolyte support. The solution voltammetric studies of the dendrimers G1-Fc16 and G2-Fc32 exhibit the pattern of communicating ferrocenyl sites with two distinct, separated oxidation waves. The dendrimers were also deposited on electrode surfaces and the electrodes investigated via CV, showing formation of electroactive films with promising results for the use of these materials in the development of biosensors.