Abstract
The traditional picture of a metallocene, in which the metal atom is linearly bonded to each of the carbon atoms of the aromatic rings, is re-examined. In contradistinction to such a representation in which there are covalent linear bonds from the metal atom to all (or, in the case of mono-hapto metallocenes, some) of the carbon atoms of the rings, a new geometric picture employing a space-filling bond is proposed to describe this connectivity; namely, let the metal atom be bonded to the entire ring structure in the form of a cone of two nappes (or, in the mono-hapto case, a cone of one nappe and a traditional single bond to only one of the carbon atoms of the other ring). Such an interpretation would imply scrapping the, until now, universally accepted isomorphism between a structural formula in chemistry and a graph in mathematics—at least for this class of molecules.
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