Planar hexacoordinate carbon

Planar hexacoordinate carbon in chemistry describes a molecular geometry featuring a planar arrangement of carbon with six surrounding atoms. No actual chemical compounds having this particular hexacoordinate configuration have been reported but quantum mechanical methods have demonstrated that these molecules are a possibility. Examples of molecules investigated with computational methods are the B₆C dianion, the CN₃Be³⁺ ion ,the CO₃Li³⁺ ion and the CN₃Mg³⁺ ion. A simulated B₂C monolayer is reported to consist of quasi-planar hexacoordinate carbon atoms.