The resulting destabilization of the LUMO forces electron pairing, leading to a closed-shell ground state. The nature of interactions leading to electron pairing are unclear, due to variations in geometry around Co, which lead to low-symmetry Co centers and significant intermixing of the Co 3d valence levels. We postulate the presence of a multi-center 2-electron bond, mediated by the bridging silane ligands, like those observed in 3 and 4 but lacking a direct Co-Co σ overlap component. Such multicentered bonds have been previously proposed in multimetallic complexes featuring Si-based ligands. MO contour plots show an occupied valence level with spin density shared between Co and bridging silanes, consistent with a multicentered bonding interaction (Figure ). This MO contains 8.0% Co 3d and 4.2% Si 3p character, with the remainder distributed across the molecule, indicative of a highly delocalized occupied MO with significant multicenter character.