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The crystal structure of a solvated zirconocene penta-fulvene complex with a bulky adamantyl-idene substitution pattern, namely (η 5 ,η 1 -adamantyl-idene-penta-fulvene)bis-(η 5 -cyclo-penta-dien-yl)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 adamantyl-idene-penta-fulvene 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 mol-ecules of [η 5 :η 1 -adamantyl-idene-penta-fulvene]bis-[(η 5 )-cyclo-penta-dien-yl]zirconium(IV), together with half a mol-ecule of toluene disordered with half a mol-ecule of n -hexane (the solvent mol-ecules have no direct influence on the complex). In each of the four complex mol-ecules, the central Zr IV atom has a distorted tetra-hedral coordination environment. The measured crystal consisted of two domains with a refined ratio of 0.77:0.23.

acta crystallographica. section e, crystallographic communications

Crystal structure of the formal 20 electron zirconocene pentafulvene complex Cp2Zr(η5,η1-adamantylidenepentafulvene):toluene:n-hexane = 1:0.125:0.125