Revisiting the bonding nature of pyramidane: an analogue of the CO molecule.

Pyramidane (C(CH)) and its derivatives have garnered considerable interest in organic and synthetic chemistry due to their distinctive pyramidal geometry. Nevertheless, the non-classical bonding pattern between the pyramidal apex and base remains insufficiently elucidated. This work firstly developed a two-dimensional (2D) superatom-atom super bonding framework, providing new insights into the bonding nature of C(CH).