An actinocene is a type of metallocene compound that contains an element from the actinide series. The typical structure is a sandwich compound, with two cyclooctatetraenyl dianions (cot, which is C
8) bound to an actinide-metal center (An) in the oxidation state IV, with the resulting general formula An(C8H8)2
The actinide-cyclooctatetraenyl bonding was shown by computational chemistry to be mainly due to mixing of actinide 6d orbitals into ligand π-orbitals and therefore donation of electronic charge to the actinide, with a smaller such interaction involving the actinide 5f orbitals. 
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