eV to an astonishing 4.95 eV. Admittedly, the adiabatic gaps are much lower, reflecting large geometry changes in the triplet state, but they are still large, > 2 eV. Second, aside from the Cp*Si + cation, the p-complexes decamethylsilicocene and the silapyramidane do not exhibit a positive vertical electron affinity -in fact, the vertical EAs are strongly negative! This property is also shared by Me2ImSi and its saturated dihydro counterpart H2Me2ImSi. In other words, these molecules are not expected to exhibit electron attachment in the gas phase and, by extension, may also be expected to withstand nucleophilic attack, at least to a degree, in solution.