Figure 9.

Two additional representations of the B₄H₁₀²⁺ dication. In both, the octahedral relationship of the bridging H atoms is emphasized. The remaining four B–H groups cap four faces of the octahedron. The orientation of the dication in (a) is similar to that of the structures in Figure 8, while the dication has been reoriented in (b) so as to show the octahedron in a more familiar orientation.