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- ItemCrystal structure of di-n-butÂylÂbisÂ([eta]5-pentaÂmethylÂcycloÂpentaÂdienÂyl)hafnium(IV)(Chester : International Union of Crystallography, 2015) Arndt, Perdita; Schubert,Kathleen; Burlakov, Vladimir V.; Spannenberg, Anke; Rosenthal, UweThe crystal structure of the title compound, [Hf(C10H15)2(C4H9)2], reveals two independent molÂecules 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 HfIV atom is coordinated by two pentaÂmethylÂcycloÂpentaÂdienyl and two n-butyl ligands in a distorted tetraÂhedral geometry, with the cycloÂpentaÂdienyl rings inclined to one another by 45.11 (15) and 45.37 (16)°. In contrast to the isostructural di(n-butyl)bis([eta]5-pentaÂmethylÂcycloÂpentaÂdienÂyl)zirconium(IV) complex with a noticeable difference in the Zr-butyl bonding, the Hf-CbutÂyl bond lengths differ from each other by no more than 0.039 (3) Ã….