Crystal structure of di-n-but­yl­bis­(η (5)-penta­methyl­cyclo­penta­dien­yl)hafnium(IV)

The crystal structure of the title compound, [Hf(C(10)H(15))(2)(C(4)H(9))(2)], reveals two independent mol­ecules in the asymmetric unit. The diffraction experiment was performed with a racemically twinned crystal showing a 0.529 (5):0.471 (5) component ratio. Each Hf(IV) atom is coordinated by two penta­methyl­cyclo­penta­dienyl and two n-butyl ligands in a distorted tetra­hedral geometry, with the cyclo­penta­dienyl rings inclined to one another by 45.11 (15) and 45.37 (16)°. In contrast to the isostructural di(n-butyl)bis(η (5)-penta­methyl­cyclo­penta­dien­yl)zirconium(IV) complex with a noticeable difference in the Zr–butyl bonding, the Hf—C(but­yl) bond lengths differ from each other by no more than 0.039 (3) Å.