A topological Hückel model for organometallic complexes. Part II. Alternant bonding networks in η3- and η4-olefin complexes

Abstract

Within the Hückel approximation, metal η³- and η⁴-olefin complexes are shown to have alternant bonding networks. Application of the pairing theorem to such systems indicates the electronic origins of the 18-electron rule and provides some insight into the chemical properties of these molecules. The topological implications of the bonding network in η-allyl complexes are also discussed.