Crystal structure of bis­(η(2)-ethyl­ene)(η(5)-penta­methyl­cyclo­penta­dien­yl)cobalt

The title compound, [Co(C(10)H(15))(C(2)H(4))(2)], was prepared by Na/Hg reduction of [Co(2)(C(10)H(15))(2)(μ-Cl)(2)] in THF under an ethyl­ene atmosphere and crystallized from pentane at 193 K. The Co—C(olefin) bonds have an average length of 2.022 (2) Å, while the Co—C(penta­dien­yl) bonds average 2.103 (19) Å. The olefin C=C bonds are 1.410 (1) Å. The dihedral angle between the planes defined by the cyclo­penta­dienyl ligand and the two olefin ligands is 0.25 (12)°. In the crystal, mol­ecules are linked into chains by C—H⋯π inter­actions.