page_title: Transition metal arene complex
section_title: Structure
hierarchical_section_title: Transition metal arene complex / Structure
caption_attribution_description: English: Hapticity change for bis(hexamethylbenzene)ruthenium
context_page_description: Metal arene complexes are organometallic compounds of the formula ₓMLy. Common classes of are of the type ML₃ and (C₆R₆)₂M. These compounds are reagents in inorganic and organic synthesis. The principles that describe arene complexes extend to related organic ligands such as many heterocycles and polycyclic aromatic compounds.
context_section_description: In most of its complexes, arenes bind in an η⁶ mode, with six nearly equidistant M-C bonds.  The C-C-C angles are unperturbed vs the parent arene, but the C-C bonds are elongated by 0.2 Å.  In some complexes, the arene binds through four carbons (η⁴ bonding), in which case the arene is no longer planar. A well studied example is [Ru(η⁶-C₆Me₆)(η⁴-C₆Me₆)]⁰, formed by the reduction of [Ru(η⁶-C₆Me₆)₂]²⁺.
  In the fullerene complex Ru₃(CO)₉(C₆₀), the fullerene binds to the triangular face of the cluster.
caption: Hapticity change for bis(hexamethylbenzene)ruthenium.
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