Closo-carborane anions are prominent, whereas the cations of the same are less abundant in the literature. As these ions have similar size and are weakly coordinating, the ionic liquids of these two ions could have important applications in many areas of chemistry. In view of limited number of polyhedral carborane cations available, we revisited the rearrangement of dicarboranyl methyl cation (7-CH2 7,9-nido-C2 B9 H10 + ) using ab initio molecular dynamics calculations with metadynamics. Our simulations confirmed the concerted mechanism of the rearrangement. We believe this work will resume the interest in its synthesis and carborane cations in general.

Department of Chemistry Boston University Boston Massachusetts USA

Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore India

Institute of Inorganic Chemistry Czech Academy of Sciences Husinec Řež Czech Republic

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Boron-based octahedral dication experimentally detected: DFT surface confirms its availability