 A large majority of the organoactinides involve Cyclopentadienyl (Cp), Cyclooctatetraene (COT) and their derivatives as ligands.These usually take part in η-5 and η-8 bonding donating electron density through their pi orbitals.Actinides form sandwich complexes with cyclooctatetraene analogously to how transition metals react with cyclopentadienyl ligands, actinide ions have an atomic radius that is simply too large to form MCp2

compounds and this is why they react with C8H82- ions instead.