The dianion of tetraphenylgermole is aromatic

Article abstract of DOI:10.1002/anie.199610021

Not one, but two structurally distinct forms are obtained depending upon the crystallization temperature when Li₂(Ph(C]₄Ge) crystallizes from dioxane. In one form (left) the two lithium ions are located on opposite sides of the germole rings each η⁵ coordinated to all of the ring of atoms. In the other form (right), one lithium ion is η⁵ coordinated to the ring atoms and the other is η⁵ coordinated to the germanium center. The C C distances within the ring of the germole dianion are nearly equal, indicating that the binding is highly delocalized.