Polyanionic and electroactive hybrids based on octasilsesquioxanes bearing eight metallacarborane units are developed. The grafting of these metallacarboranes to octavinylsilsesquioxane (OVS) produces an outstanding thermal stability on the final hybrids. Remarkably, these materials exhibit high solubility in organic solvents. Electrochemical studies show that the peripheral metallacarboranes act as independent redox units and simultaneously undergo the redox process, despite the rigid nature of OVS, providing insight into electron transfer in dendrimers.

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