The Dewar-Chatt-Duncanson model describes an alkene–metal bond through donation from the filled alkene orbital to the metal and pi backbonding from the metal into alkene . Backbonding weakens and lengthens the alkene double bond. A early-metal ion has little conventional -electron backbonding.
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The Dewar–Chatt–Duncanson model is a theoretical framework used to describe the bonding and electronic structure of transition metal complexes, particularly those involving π-acceptor ligands such as carbon monoxide (CO). Developed by chemists Robert Dewar, Keith Chatt, and John Duncanson, the model is particularly relevant in the context of metal-ligand interactions, elucidating how metal and ligand interactions occur through overlap of orbitals.