The 12-vertex endohedral cluster [Ru@Ge12](3-) reveals an unprecedented D2d-symmetric 3-connected polyhedral geometry. The structure contrasts dramatically with the known deltahedral or approximately deltahedral geometries of [M@Pb12](2-) (M = Ni, Pd, Pt) and [Mn@Pb12](3-) and is a result of extensive delocalization of electron density from the transition-metal center onto the cage.

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Synthesis and Characterization of [Ru@Ge 12] 3-: An Endohedral 3-Connected Cluster. -Compound (III) crystallizes in the monoclinic space group P2 1 with Z = 2. The 12-vertex endohedral cluster [Ru@Ge 12] 3exhibits an unprecedented D2d-symmetric 3-connected polyhedral geometry. The cluster is further characterized by DFT calculations. -(ESPINOZA-QUINTERO, G.; DUCKWORTH, J. C. A.; MYERS, W. K.; MCGRADY*, J. E.; GOICOECHEA, J. M.; J. Am. Chem. Soc. 136 (2014) 4, 1210-1213, http://dx.