Abstract
Abstract An bibliographic review of the crystallographic literature describing transition metal carbonyl structures has been conducted in order to ascertain the prevalence of M–CO(lone pair)…π(arene) interactions. The geometric constraints were such to limit the search to a terminal carbonyl ligand interacting with a ring centroid of an arene ring, that is, for delocalized M–CO(lone pair)…π(arene) interactions operating in isolation of complementary supramolecular synthons. M–CO(lone pair)…π(arene) interactions were found to be important in stabilizing supramolecular architectures and to lead to, usually, zero-dimensional aggregation patterns. One-dimensional examples are also known and even a sole three-dimensional example is described. An evaluation of the crystal packing of a transition metal carbonyl structure is incomplete unless an analysis for M–CO(lone pair)…π(arene) is conducted.
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