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The chemical structure of uranocene includes a uranium atom sandwiched between two cyclooctatetraenyl groups

An actinocene is a type of organoactinide 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
) bound to an actinide-metal center (An) in the oxidation state IV, with the resulting general formula An(C8H8)2[1]

The most studied actinocene is uranocene, U(C8H8)2.[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. [3]

Other actinocenes include protactinocene (Pa(C8H8)2), thorocene (Th(C8H8)2), neptunocene (Np(C8H8)2), and plutonocene (Pu(C8H8)2).

Sandwiched M(C8H8)2 compounds (actinocenes and lanthanocenes) exist for M = Nd, Tb, Pu, Pa, Np, Th, U and Yb.[2]

See also


  1. ^ Minasian, Stefan G.; Keith, Jason M. (2014). "New evidence for 5f covalency in actinocenes determined from carbon K-edge XAS and electronic structure theory" (PDF). Chem. Sci. 5 (1): 351–359. doi:10.1039/C3SC52030G.
  2. ^ a b Seyferth, D. (2004). "Uranocene. The First Member of a New Class of Organometallic Derivatives of the f Elements". Organometallics. 23 (15): 3562–3583. doi:10.1021/om0400705.
  3. ^ Kerridge, Andrew (2014). "f-Orbital covalency in the actinocenes (An = Th–Cm): multiconfigurational studies and topological analysis" (PDF). RSC Advances. 4: 12078–12086. doi:10.1039/C3RA47088A.