Ferrocene derivatives bearing the 8-quinoline-tetramethyl-Cp ligand (1) possess a free nitrogen donor function. Because of the methyl groups at the Cp ring, the quinoline adopts an orientation that locates the N-donor above the five-membered ring. Additional molecules that are bound by the N-donor function are therefore in proximity to the π-system of the Cp ring. Zinc dichloride, which binds to the N-donor, interacts slightly with the ferrocene moiety, and the triple-decker-like complex 5 is formed. The more Lewis acidic boron trichloride interacts with the functionalized Cp ring much more strongly so that the iron(II) ion cannot compete and is eliminated. Thus the organoborane 6 with intramolecular donor coordination is formed quantitatively.

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The donor‐functionalised cyclopentadiene derivative 1 acts as a neutral chelate ligand and forms the zinc and mercury complexes 2 and 3 upon treatment with HgCl2 or ZnCl2. Due to the predefined geometry of 1, the MCl2 moieties are found in close proximity to the π‐system of the cyclopentadiene. In the mercury compound 3 there is some evidence for a bond between the d10‐ion and the ring carbon atoms, although this is not conclusive. The zinc compound 2, however, clearly shows an interaction between the metal atom and the cyclopentadiene fragment. At the same time the bond between the Cp ring and the Me3Si group is weakened.

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