Crystal structure of the formal 20 electron zirconocene penta­fulvene complex Cp(2)Zr(η(5),η(1)-adamantyl­idene­penta­fulvene):toluene:n-hexane = 1:0.125:0.125

The crystal structure of a solvated zirconocene penta­fulvene complex with a bulky adamantyl­idene substitution pattern, namely (η(5),η(1)-adamantyl­idene­penta­fulvene)bis­(η(5)-cyclo­penta­dien­yl)zirconium(IV)–toluene–n-hexane (8/1/1), [Zr(C(15)H(18))(C(5)H(5))(2)]·0.125C(7)H(8)·0.125C(6)H(14), is reported. Reducing zirconocene dichloride with magnesium results in the formation of a low-valent zirconocene reagent that reacts readily with adamantyl­idene­penta­fulvene to give the aforementioned complex. Single crystal X-ray diffraction proves the dianion-like η(5):η(1) binding mode of the fulvene ligand to the central Zr(IV) atom. The asymmetric unit contains four independent mol­ecules of [η(5):η(1)-adamantyl­idene­penta­fulvene]bis­[(η(5))-cyclo­penta­dien­yl]zirconium(IV), together with half a mol­ecule of toluene disordered with half a mol­ecule of n-hexane (the solvent mol­ecules have no direct influence on the complex). In each of the four complex mol­ecules, the central Zr(IV) atom has a distorted tetra­hedral coordination environment. The measured crystal consisted of two domains with a refined ratio of 0.77:0.23.